A multi-core CPU is a kind of CPU that has two or more actual chips inside it (known as cores). This allows a computer to actually be processing multiple things at once and is often seen as the solution to continuing Moore's law.

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Why is my dual-core CPU recognized as a quad-core one?

My processor is an Intel Core i3-380m. As you can see, it's 2 cores and 4 threads. Although, both Ubuntu 11.04 and Windows 7 seem to think it's a quad-core CPU: Why is this? Is it because there ...
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12answers
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CPU Cores: The more the better?

I currently have a dual-core processor at work and a quad-core at home. I've noticed both PCs are pretty equal as far as launching applications/surfing the web. The difference I can see is that my ...
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7answers
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How to tell how many CPUs (cores) you have on Windows 7

I got me a nice new laptop and I want to know a bit more about the hardware. How can I see how many CPUs my computer has in Windows 7? (Note: Clicking on Start->Right clicking on Computer-> ...
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Hyper-Threading and Dual-Core, What's the Difference?

In a conversation with the network administator, I mentioned that my machine was a dual-core. He told me it was not. I brought up the task manager, went to the perfomance tab, and showed him that ...
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Why does my Intel i7-920 display 8 cores instead of 4 cores?

When I go to the task manager I see 8 processors but I know that I have 4. Why?
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Why is my laptop both dual core and quad core at the same time [duplicate]

I bought an Alienwaremx14 with the following specifications , it is clearly stated here that my CPU is dual core However when i open Window task manager , I was shocked to find out I had four CPU ...
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10answers
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How do I calculate clock speed in multi-core processors?

Is it correct to say, for example, that a processor with four cores each running at 3GHz is in fact a processor running at 12GHz? I once got into a "Mac vs. PC" argument (which by the way is NOT the ...
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6answers
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How to limit a process to a single CPU core?

How do you limit a single process program run in a Windows environment to run only on a single CPU on a multi-core machine? Is it the same between a windowed program and a command line program? ...
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Does the Intel i7 offer real improvement over its predecessors? [closed]

As the questions title asks, do the new processors from Intel offer real, as in noticeable, improvement over the previous quad core ones? What does the i7 actually offer that is new or is it simply a ...
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Does OS allocate each process to a separate core?

Ok I know the classic argument for avoiding quad cores. At the application level, most applications haven't been written for multiple cores. Most desktop software doesn't even need parallelization. ...
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13answers
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What are the benefits of a dual-core CPU over a quad-core in a desktop PC?

I know that in most cases when you buy a dual-core CPU for the same price you could get a quad-core, you end up getting 2 cores that are faster individually than the 4 cores individually in the ...
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3answers
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Windows 8 task manager: single-core CPU graph only?

On multi-core CPU systems, Windows 7's task manager used to display a separate utilization graph for each core unit: On Windows 8 the task manager looks much fancier, and yet it shows a single ...
13
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Why is the “top” command showing a CPU usage of 799%?

I am running a process in a 4 core Ubuntu server. However, top command shows that the CPU usage is 799% all the time. How can this be possible? I know for multi core CPUs, more than 100% CPU usage ...
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5answers
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Is a higher core count or higher clock speed more beneficial to a computer's performance? [closed]

With lowering silicon costs and rising consumer needs, manufacturers seem to be pushing one of two things: clock speed and/or core count. With the way things are going, it doesn't seem that clock ...
12
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5answers
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Why multi core processors?

Why are chips containing more and more cores? Why not manufacture a larger single-core processor? Is it easier to manufacture? Is it to allow programs to multithread using seperate cores?
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5answers
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What's the difference between multicore proc and multiproc system?

I wonder what's the difference between a dual core computer and a computer with 2 processors on the mother board.. I think it's something related with the threads but a I don't understand it very ...
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2answers
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What is the effect of booting with additional cores?

I was reading about ways to enhance speed in Windows 7, and I read that you can enable Windows to boot off of four cores vs one to boot faster. Is there a reason why you do not want to use all four ...
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3answers
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7-Zip compression on multi-core computers

Does 7-Zip take advantage of multiprocessor or multi-core systems when compressing? For example, would there be a close to 16 times speed-up on a 16 core system assuming no disk or memory ...
8
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2answers
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Force a single core program to use multi core

The title says it all, is there a way to force a single cpu core designed program (older programs) to use multiple cpu cores?
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7answers
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What is the difference between MultiCore and MultiProcessor? [duplicate]

Possible Duplicate: What's the difference between multicore proc and multiproc system? What is the difference between MultiCore and MultiProcessor please?
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4answers
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Do multi-core CPUs still suffer from diminishing returns in today's world?

It has been shown in other questions that due to the state of computer applications, multi-core processors suffer from diminishing returns. Is this still the case in today's world? Do most new ...
7
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4answers
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How fast is each core in a dual-core processor?

My Macbook has a 2.4 GHz dual core processor. Because it has two separate cores, that means it can execute two functions at once, right? So does that mean each core is approx. 1.2GHz each (for a ...
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4answers
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How to enable multiple processors on XP SP 3?

I've got a Lenovo n100 laptop that's 3 years old. It dual boots the original Windows XP that came with it and Ubuntu, and I just now noticed that the XP installation, on the Task Manager, only shows 1 ...
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4answers
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How do different Linux distributions handle multiple cores and multi-threading?

I realize that by asking this question I have already labeled myself as "unprepared" for high-performance workstations, but whatever, you have to start somewhere! I would like to know how different ...
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8answers
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Choosing Dual or Quad Core [closed]

I was reading the Jeff Atwood post on this topic and was wondering how much of that is still true today. His post is from Sept. 2007. This question stems from another question I asked recently which ...
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3answers
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Is there a simple UNIX command for finding out how many cores I have to work with?

I've got an Ubuntu VM on my Mac. Is there a command I can run in Ubuntu that will tell me how many cores I have to work with? I could do "about this mac" on the host, but I'm not sure how well the ...
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Would my virus scanner be able to scan multiple files concurrently with dual CPU instead of multi-core?

Anti-virus: Microsoft Security Essentials OS : Windows 7 x64 Silly question perhaps, but somehow I was under the impression that multiple cores would mean the anti-virus scanner would be ...
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3answers
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Mixing CPUs in a multi-CPU system

Mixing types of RAM is not always healthy, but I am curious as to what happens (if anything) when mixing CPU types in a system. Example: 8-Core 2.0Ghz Magny Cours CPU in socket 0 12-Core 2.0Ghz ...
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3answers
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Can a multi-core processor run multiple processes at the same time?

I understand that a multi-core processor can run multiple threads of the same process at the same time using its different cores. Can it also run multiple processes at the same time(each core running ...
6
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3answers
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What is the difference between “Intel Pentium Dual-Core” and “Intel Core 2”

I can't seem to understand what is the difference between the two, seen in wikipedia. I think I've got it that they are both 64bit, but other then that, I'm lost.
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1answer
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Windows Virtual PC, multi-core possible?

I have a PC based on a "Intel i7 975". My OS is "Win7 Ultimate 64bit", and I have installed "Windows Virtual PC" + "XP Mode". My problem is that only ONE core is virtualized, so, can I virtualize two ...
6
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1answer
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Setting permanent process CPU core affinities in Windows

I am planning on getting a new CPU and am looking at a quad core i5. The reason for the quad-core is that I generally multi-task a lot for example running Visual Studio, Eclipse Aptana, Photoshop, ...
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When should I activate the “launch folder windows in a separate process” option?

In folder options -> view, there's an option that's off by default called "Launch folder windows in a separate process". I'm on windows-7, but I know this capability has existed since at least windows ...
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ffmpeg encoding on QuadCore

I am trying to push my server's CPU cores to the max, but no success. Encoding 2-pass style, set my "-threads" to 128 . When running 2nd pass , the CPU seems to be at 98% usage, but first pass run ...
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How do multi-core CPUs work?

I know, vague question title, but my main question is, does 1 core have to execute only one program at a time? Does the "multitasking" at the CPU level work by switching between tasks, and if so, why? ...
5
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1answer
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Multicore system. How are the cores “sorted”

If I have a system with let's say two Quadcore CPUs and HyperThreading enabled, how do I know how the phsyical and virtual cores are sorted? For example if I force a process to run on "CPU 0" how to ...
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How to disable 2 cores on a quadcore i7?

I have a laptop with a quadcore i7 that runs hot. I don't need 2 of the cores. How can I shut them off?
4
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5answers
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Upgrading from single core to dual core - Will throughput get doubled?

If i replace a single-core processor with a dual-core processor, Will it increase the throughput by two times ? If No, why throughput does not get doubled ?
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How many instances of FFmpeg commands can I run in parallel?

I tired running 8 commands in parallel to fully utilize the CPU and speed up Video conversions, something like this: ffmpeg -i input.mp4 -t 60 -f mp4 /mnt/a.mp4 > /dev/null 2>&1 & ...
4
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How to make commands in Mathematica 8 use all cores?

Many commands in Mathematica 8 (Integrate, Simplify, etc.) seem to only be using a single core on my system. Is there any way I can change the affinity so that it utilizes all cores for computations?
4
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Efficient way to use all cores in bash or zsh script

If I want to process large number of files with command "do_something" which only can use one core, what's the best way to use all available cores assuming each file can be processed independently? ...
4
votes
2answers
134 views

What should I be looking at in order to speed up a program that needs a lot of processor power and cores?

I want to build a system in order to run one particular specialised program as fast as possible (currently it can take up to 50 hours to do a run on my laptop with an I5-processor). The program is ...
3
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3answers
783 views

Multi-core processors: Better performance running multiple applications?

I realize for single applications - the application itself has to be designed to take advantage of multiple cores. But what about executing many different applications simultaneously? On my ...
3
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Quadcore or Dual QuadCore?

As a DBA, which would you pick for your workstation? QuadCore 2.4GHz with 12GB ram or Dual QuadCore 2.0GHz with 6GB ram?
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Is there a RAR extractor (for multiple rar files like .r00 etc.) that will use all of my quad cores?

I've got a quad core Intel processor. I've got a big file split into little ones as RAR files, foo.r00, foo.r01, etc. which the RAR program extracts into one file/directory. Is there a RAR program ...
3
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Linux 'top' utility wildly inaccurate (more so for multi-CPU/core hardware)?

After using top for long time, albeit basically, I have grown to distrust its % CPU column reports. I have an 8-core (quad core Intel i7 920 with hyperthreading) hardware, and see some wild numbers ...
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Safe temperature range for a Core 2 Quad CPU? [duplicate]

Possible Duplicate: Does anyone know the temperature ranges one can expect on a core2 duo I've looked around for an answer to this for a while, and have found many conflicting answers. I've ...
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Why does VirtualBox show more CPUs than available?

I have an Intel Core i7 3930K with 6 CPU cores. Now, I understand that every of that cores can handle 2 separate threads. That makes 12 virtual cores - which I can see using my system monitor (see ...
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Why is my Dell Vostro 3500 overheating? The internal temperature is around 75 C

I felt that my Vostro laptop is overheating. I downloaded a tool named SpeedFan to test my internal laptop temperature. Speedfan gives the following measurements: Temp1: 75 C Core0: 70 c Core1: ...
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Processor advertised with 2 cores but PC shows 4 cores

I recently purchased an Intel i5-650 processor. On the Intel site, this the technical specifications show that the processor should only have two cores. ...