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

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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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256 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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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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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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214 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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79 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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170 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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365 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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Do the temperatures indicate my laptop healthy?

The temperatures of my Thinkpad T400 are: acpitz-virtual-0 Adapter: Virtual device CPU_0: +57.0°C (crit = +127.0°C) CPU_1: +56.0°C (crit = +100.0°C) thinkpad-isa-0000 Adapter: ISA ...
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182 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 dont hatve that kind of wallet to be able to pull that out. is anyone of you that had this problem?? what I want to know ...
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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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285 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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59 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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275 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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48 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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194 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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257 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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394 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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37 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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117 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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154 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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349 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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242 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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157 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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419 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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205 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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PC Won't Sustain Power

I've been using this system almost every day for the past 7 months. It has worked completely fine with no indication of error at all, but now it will not power on. Whether I use the casr button, the ...
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48 views

CPU usage while uploading video

This may be a dumb question, but when I'm uploading video to YouTube (through the site's own upload form, in Firefox, running on Linux), I see more activity in my CPU status monitor and hear the fan ...
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38 views

Acer Laptop Performance Loss Plugged in

A few days ago I acquired a Brand New Acer Aspire E 15 E5-571-74AP laptop, and found a frustrating problem. Whenever the laptop is unplugged, the performance on games and other programs is stunning. ...
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Computer fully restarts with no POST under any significant load

Specs: i5 3570k GTX 670 Corsair HX750 PSU I built my desktop a few years back and it has worked like a charm up until the past week. Whenever I try to play any game, besides non-intensive stuff like ...
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How can cpu-intensive processes slow down a system despite having a scheduler?

I've encountered it on both Windows and Linux that if some process is doing some heavy work and the cpu is under a lot of stress, the whole system can sort of freeze, other processes get slow, etc. ...
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How to diagnose slow (only for awhile after start) Windows 7 machine?

I've got a Lenovo Ideapad, with a dual core Atom processor and Windows 7 that exhibits some odd behaviour. It's insanely slow right after boot. The disk drive will be lit up solid and grinding away ...
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WPA shows NIC driver DPC fragment running for 232 milliseconds

I'm stress testing my UDP proxy on a machine with 8 logical CPUs. At around 14 thousand UDP clients, one of the CPUs (CPU 4) starts spiking and UDP throughput (as shown by Task Manager) plummets to ...
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where can I find intel opcodes

Where can I find all intel opcodes? I'm talking about actual values of cpu asm commands, 0s and 1s of the keywords such as MOV, JMP, CMP etc. Are they available to the public?
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PC shutting down every 30 minutes

I changed my graphics card and PSU today (went from 650Ti to GTX 770 and Thermaltake PurePower 430W to OCZ GameXStream 600W). I plugged these components in, at first I didn't fit the 20+4 pin ...
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What is the relationship between PMU and PEBS for intel CPU?

I know for intel CPU families, there are PMU (Performance Monitoring Unit) and PEBS (Precise Event Based Sampling). What is the relationship between them? Per my understanding, the PMU contains PEBS, ...
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109 views

Does the ASUS P7P55D Motherboard support the 4th generation Intel Core i5 processor?

I have a PC I built based on the ASUS P7P55D motherboard. Currently it has an Intel Core i5-750 LGA1156 processor in it, a 3rd generation processor. I just found out that to run the Intel RealSense ...
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Need illustrated advice on Socket P/Merom BSEL mod

I have got Intel T2370(133FSB/Socket P/Merom) CPU and ASUS F5SL(SIS chipset) laptop. I see those as perfect candidates for BSEL pinmod yet I can't find detailed sure description on how to do it. ...
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how to check list of application running in core in windows 7

I need to know list of application (.exe) running on single core (cpu) in windows for e.g cmd.exe (application) is running on 2th core
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Asus motherboard with 'CPU_LED' on

First, Here are some pictures of what I'm seeing. Here is by build: CPU | AMD FX-8320E 3.2GHz 8-Core Processor CPU Cooler | Silverstone AR03 81.4 CFM Sleeve Bearing CPU Cooler Motherboard | ...
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HP laptop doesn't power up

I am kindly asking for your help. I have an HP DV7T-6C00 laptop which doesn't power up at all. I have read various forum threads and they did not solve my problem that's why I'm opening a new one. It ...
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179 views

What is Prime95 benchmarking?

I've recently had to benchmark the CPU performance of a variety of operating systems on identical machines. I've been using the 'benchmark' functionality of Prime95 to obtain a consistent test. I've ...
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104 views

Should you worry about high voltage and wattage on a non-overclocked computer?

I've been wondering if I should be worried at all about high wattage or voltage on a non-overclocked computer. I say non-overclocked because when I Google search this question or something similar it ...
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nice has no effect in Linux unless the same shell is used

If I enter in two different root terminals: nice -n 19 burnK7 & and nice -n -19 burnK7 & Then both processes receive about 50% of the available CPU time - not expected and certainly not ...
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Show all running tasks in Assembly

Is it possible to show/log everything what the CPU does? The CPU knows what it executes, so it could print the running threads/tasks on the screen or in a file.
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Can I install an AMD Turion X2 64 RM-70 on a Toshiba Satellite L505D-SP6983R?

The original processor was an AMD Turion X2 64 RM-74 (dead) The board is named V000185220 Rev 1.10 This board accepts S1G2 processors, and should accept the RM-70. But I am not so confident when ...
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In Virtualbox, is it possible to change the emulated CPU name?

I have a Virtualbox VM running Windows 7. When I open Start -> Right click "Computer" -> Properties, I get the real CPU name and plausible CPU speed (not sure if it's exactly the same). Now I want ...
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Both cores run constantly at 100%

I run a dualboot Fedora/Windows 7 computer. It will work fine for the first ten minutes or so after booting, after which it is rendered completely useless and slow. CoreTemp gives that both cores ...
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294 views

Hardware concerns for optimal ruby on rails development on ubuntu machine

I've been developing dynamic web sites using ruby on rails on a 5 year old mac mini which has been great except that it takes too much time -- 15 minutes or so -- to run my simple test suites. I ...
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Comparing an i7 (3.2Ghz) against an i5 (2.5Ghz) using linpack shows the i7 being worse

I am trying to compare the number crunching performance of an i5-3210M @ 2.5GHz with 6GB ram and an i7 970 @3.2GHz with 24GB ram. The results are so unexpected I presume I am either doing something ...