A CPU (Central Processing Unit) is the chip responsible for actually "doing" most the instructions given to a computer.

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285 views

How can I prevent high CPU usage from Chrome tabs in OS X?

I do this a lot: Notice my MacBook Air is running hot Open Activity Monitor, see "Google Chrome Helper" process pegged at 100% CPU Open Chrome's Task Manager to find the responsible tab Find and ...
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39 views

How does an x86 processor recover from S2/S3 sleep?

I was reading through this page on how sleep states work in Windows and I was intrigued by the reset vector. My current understanding is that; When the system is in S2/S3, the processor is fully ...
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2k views

Windows 8.1 Process Migration Limits CPU frequency scaling

Summary: I've noticed that with Windows 8.1 on my laptop, running a single CPU intensive program does not cause the CPU frequency to scale to its maximum value. I suspect that this is because of ...
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325 views

CPU (?) Clicking Sound During Resource-Intensive Tasks

I just bought a new computer (Lenovo Yoga 13, with integrated graphics and SSD). Whenever I bring it out of sleep, or do something resource-intensive (such as heavy Photoshop work), I hear a scratchy ...
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46 views

No POST on new built desktop

I just finished building a desktop again and it will not perform a successful POST. No beeps or video either. Since my goal is a successful POST, i removed all irrelevant hardware already and am only ...
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605 views

Undervolting with Intel' XTU - which offset should you reduce?

It is a pretty basic question, but I could not find an answer to this via Google. The value you are supposed to adjust is the "voltage offset". However, there are two kinds of values in the utility ...
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86 views

Can a cooling fan be effective for my laptop?

Bit of a backstory here, skip to the bottom if you just want the question: So I recently purchased new HP laptop. Although I'm not any sort of a hardcore gamer, I like to play games that I ...
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193 views

i7 4790K | Shutdown while running Prime95 and RealBench

The computer experiences a hard reset instantly with Prime95 "Small FFTs" torture test (also with the "Blend" test but after 30 minutes) and after 4-5 passess of RealBench benchmark without any kind ...
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98 views

Can a processor gpu still be used for video transcoding if the motherboard is disabled from using processor gpu?

I am planning to get the following motherboard and cpu. Asrock Rack e3c224d4i-14s Intel Xeon e3-1276v3 However, after reading the spec sheet on Asrock Rack/Intel Ark, the above mentioned motherboard ...
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151 views

QEMU CPU Emulation Capability

Is it possible to emulate any/all Sandy Bridge CPUs using QEMu? Specifically, I am trying to get something akin to an Intel Xeon E5-26xx (a SandyBridge processor) running on hardware employing a ...
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416 views

Kernel Panic from overheating?

I believe my CPU is overheating which is causing a kernel panic and the machine reboots. It is an Intel 3612QE. I have changed the cpufrequtils scaling_governor to ondemand, conservative, and also ...
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102 views

Missing L1 cache characteristic

I wrote simple program (with help of Igor Ostrovsky's article 'Gallery of Processor Cache Effects') which supposed to examine levels of cache in my processor. According to Coreinfo provided by ...
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285 views

Troubleshooting processor upgrade, Paxville on Dell Precision 670

I've got a Dell Precision 670 with an XC837 motherboard and BIOS at version A07. I'm trying to upgrade this from using a single-core Celeron to a dual-core Paxville processor. When I install a single ...
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545 views

Asus Z97 Mark 2, i7-4790 getting CPU graphics to work

This is a new build. I've been trying for two days to get the CPU integrated graphics to work. The motherboard has a "displayport" connector which I have connected to my Asus PA246Q monitor, also ...
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271 views

system monitor showing 25 ghz cpu speed, could that have any bad effect?

http://i.stack.imgur.com/ZKl0f.jpg I have a water cooled system, but.... I don't have that kind of wallet to be able to pull that out. Is anyone of you that had this problem? what I want to know is ...
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345 views

Process tree CPU history usage, process tree memory usage (aggregated) on Windows 8.1

This question is general for Windows OS, but I would like to see a software for Windows 8.1, since this is what I use. I'm looking for software, that will take a process tree (e.g. Chrome.exe ...
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458 views

Should the CPU usage go up to 100% when swap happens on Linux

I had been running a demo system on Linux with the following kernel: 2.6.32-400.1.1.el5uek #1 SMP Mon Jun 25 20:25:08 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux And as soon as swap happens, the CPU ...
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65 views

MemTest86+ bad adresses constant despite swapping sticks, processor/MOBO to blame?

(Sorry for the wall of text, but people seem equally critical of missing details) After about 2 years without trouble, I've been having issues recently with system instability, BSODs, random ...
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366 views

AMD Phenom II X2 555 BE, core unlock suddenly not working?

I've had a Phenom II X2 555 BE for around 2 - 3 years. When I got it, I immediately core unlocked it with my ECS A880GM-A3 mobo, which makes it turn into a Phenom II X4 B55. A few days ago, I ...
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61 views

One Core Hotter and slower than others

I overclocked my Intel Core i5 3570K to 4.2GHz at 1.1V. It ran stably overnight on Prime95, but, while I was monitoring the core temps, they stuck within 45-55C with core #3 was always 3 or 4 degrees ...
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311 views

Idle CPU and CPU Power-saving mode definitions

I have a presentation on CPU's and there's some stuff I want to clarify that's defined in many research papers that I'm not fully sure about. How can the CPU ever be idle? I mean as long as you are ...
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364 views

CPU i5 750 stuck at its idle multiplier. Even when used at max

My i5 750 seems to be stuck on the idle multiplier (9x) instead of the base speed of 2.66 GHz, even while loading using Prime 95 Configuration: i5 750 DP55WB desktop motherboard. 2GB DDR3 RAM PSU: ...
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481 views

Windows Explorer 25% CPU usage while computer is idle?

I am facing a problem with my Windows Explorer. I cannot figure out why this happens even if the computer is idle. When I try to run some games that are old(released before 2005), at first trial the ...
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42 views

Energy Lost on CPU Propagation Delay

I was wondering if anyone had some statistics about the average amount of energy that is lost on the process of propagation delay in moving a signal from one place on the CPU to another. I'd prefer ...
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118 views

Haswell power efficiency compared to Ivy and Sandy

After reading a few reviews about the Haswell CPU series, I concluded that upgrading from Ivy or Sandy bridge might not be worth it considering the limited power gain. However Intel does advertise ...
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160 views

Correct CPU Frequency in BIOS

One of the machines I have is a 10 year old one. I can't discard it due to some sentiment (Mom). Legacy board: Mercury 810e, 133 MHz FSB Processor: Pentium III Tualatin 1.2 GHz Observation: I see ...
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411 views

Alternative (cooler) CPU than a Intel Celeron M 420 1.6GHz?

I bought a broken Toshiba Satellite A105-S2101 laptop off eBay. It would freeze on the BIOS loading screen; I found out it was just a bad DVD drive. I replaced it and all is well, except it overheats ...
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305 views

Upgrading Core i3 540 -> i5 760

I have Gigabyte H55M-UD2H motherboard with 8Gb (2x4Gb) RAM and Radeon HD 5770 graphics. I am trying to upgrade my processor from Core i3 540 to i5 760 but the system won't boot; no POST beep even ...
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164 views

Display drivers have stopped responding and has recovered

I recently purchased this http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1723935&CatId=7182 I installed it and started experiencing some serious problems. When i do ...
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442 views

Dynamic/Static CPU Frequency Scaling

I need to manipulate frequency of each core in my I7 processor. There is a way to do it in Debian (http://wiki.debian.org/HowTo/CpuFrequencyScaling). But I want to do it on Linux Fedora and Window. ...
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214 views

Interpreting CPU BenchMark for Multi Core Systems

What is the standard ways (if any) to interpret the results of cpu benchmarking for multicore systems relative to single core systems? I am trying to compare the Passmark result of AMD 64 Vs AMD ...
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Reading CPU model specific registers on linux

I am running Ubuntu 15.10 but testes it also on Debian. I have Intel i5-5675C processor. I am using msr-tools-1.3 to do it. I am able to read register 0x00001a2 with the following command: rdmsr ...
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31 views

Laptop CPU temperatures: 65°C in idle, 100+°C in heavy load

The laptop is a 4 years old Asus N56VZ, ambient temperature is around 25°C. I've already unmounted the laptop, cleared the (not much) dust and changed the original thermal paste with Arctic MX-4, ...
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22 views

I built my first computer a few weeks ago and it was fine, but now one of the fans is getting loud at random times. Is this bad?

So a few weeks ago I built my first computer with the help of the video guide here. I bought the Newegg combo deal listed in the guide and a few other peripherals (Razer keyboard). I didn't realize at ...
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56 views

High CPU usage with unknown cause

I'm having issues with my intel i5 6600k @ 4.5 GHz. I've tried undoing the OC and I've even tried underclocking, yet the issue persists. I could use some help troubleshooting. Temperatures lie around ...
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70 views

Can the processor of an Acer Aspire XC-704 PC be replaced?

Is it possible to open up an Acer Aspire XC-704 and upgrade the components like the processor from intel celeron to i3 or i5?
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44 views

Service host: Network service; High CPU usage

Here is the offending service: It will go up to 27% while browsing pages on chrome, just while loading, stops a few seconds afterwards. But between chrome and this, my CPU usage sometimes during ...
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119 views

Abnormally slow CPU speed in Windows 10 Task Manager, with virtualization disabled

In Windows 10 Pro Task Manager, CPU speed shows a constant and unchanging value of 1.18GHz, while nominal CPU speed is 2.50 GHz. Dual Intel Xeon E5-2680 v3, on a Intel S2600CW2S server board. Per ...
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53 views

Lenovo Y40-70 CPU capped when under 40% of battery capacity

My Lenovo Y40-70 caps its CPU at 30% frequency when it's under 40% battery while running on battery. While it's charging, it's fine and always runs at 100% speed. I'm running Windows 10 and have to ...
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59 views

Intel PCM ( Performance Counter Monitor ) - Low hit rate for LLC

I am having Intel Xeon D-1520 CPU I tried to run Intel PCM to get the the L3 cache miss and hit ratio. L3MISS: L3 cache misses L3HIT : L3 cache hit ratio (0.00-1.00) Core (SKT) | EXEC | IPC | ...
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104 views

FPS drops when playing video in background

I am trying to understand why I experience FPS drops in demanding games when a video is playing in background and how to fix it. My particular setup (see the specs at the bottom): two monitors in ...
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64 views

Computer beeping with new CPU (won't start)

I tried upgrading my processor but when I boot it gives me 1 short + 1 long beep (repeating on a black/blank screen). Which would be a memory problem according to the manual. Nothing wrong with my ...
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19 views

Damaging Mainboard/CPU with a overhead transparency?

So yeah.. I recently accidently bent some of my LGA1150 CPU pins and the seller won't replace it, so I have to fix it by my own. What I'm asking myself is, Can I damage or short out my mainboard by ...
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32 views

Share CPU equally between users (not processes) in Debian?

Can I share the CPU equally between users (not processes), in Debian? For example, I have two users, I want each to be able to use 50% of the CPU - even if one user has one process running and the ...
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51 views

Mystery service taking up huge amounts of memory and forcing CPU temperature up

This started yesterday when my PC died while I was using it reasonably intensively (running a newly released game). It wouldn't give me any video output or indication that it was even getting as far ...
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56 views

Unusual CPU fan behaviour

I've recently installed a copy of Windows 7 on my new disk. The PC is geared towards quiet running, (half-passive PSU cooling, SSD disk) and I was very happy with the noise levels - the CPU fan was ...
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19 views

What does 'processor (None)' mean in lshw's output?

I am running a VM on Azure with 4-cores. I typed lshw -short and got the following: H/W path Device Class Description =============================================== ...
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86 views

Windows 7 bizarrely system slows down around 15 minutes after boot

I recently installed new hardware in my desktop rig (CPU, MB & RAM) and did a fresh Windows 7 install. The recipe for pure happiness one should think, but sadly I’ve run into a really frustrating ...
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298 views

i5-4460 or amd fx-8350 for virtual machines (vmware)?

I am building a new desktop that will be used as server in my room - it will basically run 24/7 with 20 or 30 vmware virtual machines active (windows xp installed with 512mb ram, 10 gigs of ssd) - ...
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34 views

cpu cooler thermal inertia

I got a Haswell I7-4790 ( 3.6Ghz ) with a noctua nh-d15 cooler ( only one fan installed ) and I get thermal inertia. Example: Idle cpu stable at 36 degrees. Full load ( rendering something ) : a ...