Questions tagged [cpu]

The part of a computer responsible for performing computations, often referred to as a processor.

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36
votes
4answers
8k views

Why are newer generations of processors faster at the same clock speed?

Why, for example, would a 2.66 GHz dual-core Core i5 be faster than a 2.66 GHz Core 2 Duo, which is also dual-core? Is this because of newer instructions that can process information in fewer clock ...
16
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6answers
58k views

How does Motherboard and CPU affect RAM choice?

I am seeking advice on which memory to use with my motherboard and CPU. Below are my components and some relevant information extracted from their official websites. NOTE: Although this is a very ...
69
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9answers
133k views

Are there solutions that can limit the CPU usage of a process?

I am using an old laptop and doing heavy processing that needs high CPU usage for a long time (~30mins - 2hours). When the process puts heavy load on CPU for a long time, CPU overheats and computer ...
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6answers
18k views

Very high CPU usage for Windows Audio service

I'm using a Dell XPS 13 (3960) laptop, with Windows 10 operating system. Recently, after I was hearing loud laptop fans noises even when no high resouce programs running, I decided to check, and ...
32
votes
5answers
43k views

Any way to tell apart a CPU defect from a mainboard defect?

I have a fairly modern desktop computer, an AMD Athlon II X2 based silent PC, that does not work. When turned on, it will start physically (all fans are rotating, disks start up...) but not give a ...
36
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1answer
134k views

What happens if I use RAM of a faster speed than the CPU supports?

Looking at the Intel E3-1230v2 CPU, under Memory types it says "DDR3-1333/1600". My question is, in what way does the CPU limit the RAM speed? What would happen if I put in a DDR3-2133 RAM chip ...
16
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5answers
29k views

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 ...
178
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15answers
42k views

Is the performance of a CPU affected as it ages? [closed]

This is a hypothetical question about how a CPU operates. If I purchase two identical CPUs, and use one long term (say one year), will it be identical in speed to the unused CPU? Will the number of ...
27
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3answers
137k views

What are threads, and what do they do in the processor?

I was looking at the stats for the Intel Pentium e5700 CPU. It has two cores and two threads. What do the threads do for the processor? Is there any relation between the number of cores and the ...
69
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12answers
176k views

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 ...
39
votes
3answers
25k views

What is the difference between hyper-threading and multiple cores?

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 ...
19
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1answer
48k views

How does windows “limit” the CPU (Power Options / Battery saving)

Can anyone explain how Windows effectively limits the CPU? Last time I tried some tricks to let my laptop not overheat, so I tried limiting the CPU to 70%. As for my suprise it stopped my laptop ...
15
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8answers
14k views

How to tell if a Windows computer has a 64-bit CPU or OS

How you can check if your Windows computer Has an x86 (32-bit) or x86-64 (64-bit) processor? Is running a 32 bit or 64 bit operating system?
23
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4answers
141k views

Can a 32 bit OS run in a 64 bit processor?

What's the difference between 32 bit OS and 64 bit OS? Can a 32 bit OS run in a 64 bit processor?
32
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6answers
115k views

How much memory can a 64bit machine address at a time?

If the memory is byte addressable, shouldn't it be 2^64 / (2^10 * 2^10 * 2^10) = 2^34 GB ? A general Google search says 8GB or 16GB max. How is that true? Also, how does it depend on the Operating ...
370
votes
15answers
209k views

Why are we still using CPUs instead of GPUs?

It seems to me that these days lots of calculations are done on the GPU. Obviously graphics are done there, but using CUDA and the like, AI, hashing algorithms (think bitcoins) and others are also ...
36
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4answers
30k views

What is hyper-threading and how does it work?

I've heard the term hyper-threading thrown around a bit recently, what exactly is hyper-threading and why is it important?
18
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4answers
5k views

What's the proper way to remove thermal paste from a CPU?

I'm replacing the heatsink on my CPU, and want to clear the current thermal paste. What should I do?
2
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2answers
33k views

Can 64-bit software run on 32-bit OS?

I have a 64-bit machine that has Windows 7 32-bit and Ubuntu 32-bit installed as a dual boot setup. Can I run 64-bit software on top of these 32-bit OSes, or are they a "bottleneck" limiting the true ...
369
votes
19answers
211k views

If 32-bit machines can only handle numbers up to 2^32, why can I write 1000000000000 (trillion) without my machine crashing?

32-bit computers can only store signed integers up to 231 - 1. This is why we have run out of IPv4 addresses and have entered the 64-bit era. However, the number 231 - 1 (2,147,483,647) is not as ...
163
votes
6answers
412k views

What is the difference between an Intel i7 and a Xeon quad core processor?

I know the Xeon processors have been around for a long time and are mostly used in servers, but I am curious, why do people not use the Xeons in a high performance desktop? As far as I know about ...
48
votes
1answer
13k views

Meaning of Intel processor suffixes

I just bought a Core i7 second generation machine which shows the processor in the BIOS as: Intel Core i7-2620M CPU @ 2.70Ghz I have seen i7 3rd and 4th generation processors on Google but I don't ...
14
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8answers
13k views

Can a virus melt the CPU?

I was just wondering if a virus could melt a CPU by altering te voltage in the bios. :) (and no, I'm not planning on making that kind of a virus...)
20
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5answers
43k views

How to share CPU or RAM?

In networking we share File(Disk Driver) or Databases. But how can we share CPU or RAM over the network.
15
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2answers
13k views

Difference Between Cores and Processors

I am confused by the difference between "Cores" and "Processors". A lot of the computers are 2-cores, 4-cores. Does this mean that they have one processor with 2 or 4 cores on that single processor? ...
22
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7answers
110k views

CPU Temperature sensor wrong?

Everest Ultimate is suddenly telling me that the CPU temperature (and core temps) for my E6850 Core 2 Duo is 72 degrees Celsius. When I stress-test the machine, the temp goes up to 91 degrees and the ...
11
votes
12answers
24k views

Any way to disable specific CPU idle (Cx) states?

I just got a new Toshiba Tecra S11 notebook, which has a Core i5 520M CPU, and it appears to suffer from a well-known problem: a high pitched noise when the CPU is idle. Googling around revealed that ...
9
votes
3answers
22k views

How does Intel Turbo Boost work?

I just got a new Intel CPU, and the specifications say 3.5GHz but with turbo boost to 3.9GHz. What does Intel Turbo Boost do? From the description it sounds like they are saying "The road's speed ...
12
votes
4answers
51k views

Windows 10 64-bit requirements: Does my CPU support CMPXCHG16b, PrefetchW and LAHF/SAHF?

I'm currently trying to find out whether or not it would be a good idea to update my slightly dated notebook (Windows 7, 64-bit) to Windows 10. The problem is that Microsoft states in their Windows 10 ...
8
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5answers
3k views

CPU usage shoots to ~50% and stays there until suspended

This is the Windows Vista problem, seen, I think, mostly on dual processor laptops, where % CPU suddenly shoots to about 45% and stays there. Once this has happened, % CPU will never return to normal ...
1
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1answer
2k views

Windows 10 - hal.dll / ACPI.sys / ntoskrnl.exe with high cpu (WPR file included)

I have a dell inspiron 3421 with windows 10 enterprise, fresh install. With no programs running, I get 40% cpu usage from "System" and "Interrupts" combined. Searching the problem I downloaded the ...
73
votes
6answers
42k views

How does a CPU 'know' what commands and instructions actually mean?

How does a processor 'know' what the different commands mean? I'm thinking of assembly level commands like MOV, PUSH, CALL, etc...
11
votes
6answers
97k views

How many memory addresses can we get with a 32-bit processor and 1gb ram?

How many memory addresses can we get with a 32-bit processor and 1gb ram and how many with a 64-bit processor? I think that it's something like this: 1GB of ram divided by 32bits or divided by 4? to ...
15
votes
2answers
39k views

Safe long-term CPU temp? [closed]

I'm considering running a game server for some friends and I to play on with my laptop, but while the server is running my processor use tends to go to around 55-65% and my CPU temperature hovers ...
59
votes
8answers
80k views

Is it OK to use toothpaste instead of thermal paste when fitting a CPU?

I was told many years ago to do this by someone who at the time knew more than I did. The CPU was a celeron in the Pentium 2 era. It ran cooler with the toothpaste between the chip and the heatsink ...
20
votes
3answers
34k views

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?
15
votes
1answer
77k views

What is the impact of running the CPU at 100% for long periods at a time? [duplicate]

Possible Duplicate: Is it ok to have 100% CPU usage constantly I recently upgraded computers and with this upgrade I decided to try Seti@Home to run in the background. I was watching the CPU and ...
11
votes
4answers
9k views

The difference between GPU and CPU

I know what a CPU is(I think). It's the thing who's speed is measured in GigaHertz(these days). However, you hear a lot about a GPU, and letting the GPU take over, not letting the CPU but the GPU do ...
5
votes
5answers
9k views

Setting a default CPU Frequency in Ubuntu?

How do I get Ubuntu to select a default cpufreq on boot? These are the frequencies my CPU has available: $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies 2300000 2200000 ...
25
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5answers
51k views

Can I remove and put back the heatsink of my processor without reapplying thermal paste

If I remove the heatsink from my processor temporarily, then later put it back without changing the heatsink or CPU, do I need to reapply thermal paste?
22
votes
6answers
199k views

What is the safe temperature range for a Core-i5 processor?

I have an HP laptop with with a Core-i5 450m processor and an ATI Radeon 5650 1GB graphics card. When I played crysis warhead on my system its temprature went up to 82° c. Is it safe to play games up ...
4
votes
7answers
11k views

Lightweight CPU usage monitor? [closed]

I'm looking for a lightweight CPU usage monitor, something that can sit in a corner of my screen telling me how much of my CPU is getting used. Anyone know of one?
5
votes
2answers
2k views

Upgrading laptop processor

I have a Dell Studio 17. It's a few years old, and I wanted to upgrade the processor. It currently has an Intel Core 2 Duo T5750 @ 2.00GHz My question is how can I find out which processors are ...
4
votes
5answers
3k views

Can I upgrade my laptop CPU

I have Lenovo Ideapad Y510 with dual core 1.6 Ghz processor, 1GB ram, 160GB HDD. I want to upgrade my current cpu with any latest one like i3, i5 or i7 to get more speed but don't know if it is ...
4
votes
4answers
6k views

Multi-core CPU: can I say I have a 3x2.1GHz=6.3GHz CPU?

I have an AMD A6-3500 three-core CPU. AMD System Monitor shows each core with a maximum 2100 MHz. This also shows in AMD OverDrive. Does this processor run at the speed 3*2100 MHz? Edit Can I say ...
211
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8answers
2.3m views

How can I check the temperature of my CPU in Windows?

Does Windows provide a means to check my CPU temperature natively? If not, are there any software tools which can reveal this information?
45
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2answers
130k views

x86 vs x64 - Why is 32-bit called x86? [closed]

Presumably the x86 was called so because the machines used 80386 and 80486 processors. Is that correct? Is that the right way to refer to 32-bit and 64-bit machines?
36
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7answers
13k views

Has CPU speed already broken Moore's law?

I remember sometime around 1995 having a computer with CPU speed of 75 MHz. Then a couple of years later around 1997 having one that was 211 MHz. Then a few years later around 2000 having one that ...
38
votes
4answers
11k views

Is the CPU active in Sleep mode?

Suppose on a Windows OS, you toggle the computer to go into sleep mode and put it away. As far as I know there will no programs or processes will be running. But would the processor still be running ...
18
votes
5answers
5k views

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 well....