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Dumb 2500k/2600k question.

post #1 of 14
Thread Starter 
I bought/use my sig rig mostly for gaming, but lately I have been doing a whole lot of video editing and I was thinking I could just drop in a 2600k to really speed things up but I remember reading that most games don't effectively use HT and it can be detrimental in more cases than helpful. If I grab a 2600k will I have to jump in BIOS and switch on/off HT depending on if I am actually working at work or playing vidya games like normal?
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post #2 of 14
You will be fine with hyper threading on, only some games get a drop in fps...1-2 at the most lol. I found that out with my i7 930.
Edited by Sean Webster - 10/6/11 at 12:06pm
post #3 of 14
Quote:
Originally Posted by dave12 View Post
I bought/use my sig rig mostly for gaming, but lately I have been doing a whole lot of video editing and I was thinking I could just drop in a 2600k to really speed things up but I remember reading that most games don't effectively use HT and it can be detrimental in more cases than helpful. If I grab a 2600k will I have to jump in BIOS and switch on/off HT depending on if I am actually working at work or playing vidya games like normal?
HT won't lower your FPS in games by more than 1, and in rare cases too
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post #4 of 14
As the others stated, leaving HT on will not hurt your gaming experience whatsoever.
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post #5 of 14
Thread Starter 
Thanks for the input. I had it in my mind that if a game was single threaded or something (Sins of a Solar Empire comes to mind) I would be crippling the gameplay by only giving it half of a core to run on, and that didn't seem right.
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post #6 of 14
Quote:
Originally Posted by dave12 View Post
Thanks for the input. I had it in my mind that if a game was single threaded or something (Sins of a Solar Empire comes to mind) I would be crippling the gameplay by only giving it half of a core to run on, and that didn't seem right.
HT doesnt halve each core.

It still uses the full core, then uses the "Hyper-threading technology" for that core to simultaniously do more cycles on that core.

Thats my understanding at least
post #7 of 14
Quote:
Originally Posted by Ishinomori View Post
HT doesnt halve each core.

It still uses the full core, then uses the "Hyper-threading technology" for that core to simultaniously do more cycles on that core.

Thats my understanding at least
Source: Wiki
Quote:
Hyper-threading works by duplicating certain sections of the processor—those that store the architectural state—but not duplicating the main execution resources. This allows a hyper-threading processor to appear as two "logical" processors to the host operating system, allowing the operating system to schedule two threads or processes simultaneously. When execution resources would not be used by the current task in a processor without hyper-threading, and especially when the processor is stalled, a hyper-threading equipped processor can use those execution resources to execute another scheduled task. (The processor may stall due to a cache miss, branch misprediction, or data dependency.)
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post #8 of 14
Thread Starter 
Quote:
Originally Posted by Ishinomori View Post
HT doesnt halve each core.

It still uses the full core, then uses the "Hyper-threading technology" for that core to simultaniously do more cycles on that core.

Thats my understanding at least
My understanding was that the core could accept two incoming instructions per cycle giving each about 65 percent of what it would if it was only accepting one. Giving a 30ish percent increase over single thread performance, but the single threaded stuff that doesn't like HT had me a smidge uncertain.
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post #9 of 14
You, aren't one of those Diehard-Only Numbers Matter-FPS in the right hand corner at all times while playing games constantly looking at the number drops and getting mad- kinda guys are you? If not, then you will be ok
    
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post #10 of 14
Quote:
Originally Posted by dave12 View Post
My understanding was that the core could accept two incoming instructions per cycle giving each about 65 percent of what it would if it was only accepting one. Giving a 30ish percent increase over single thread performance, but the single threaded stuff that doesn't like HT had me a smidge uncertain.
HT allows the CPU to prepare 2 tasks at the same time, and execute them in simultaneus-like manner, while still calculating only 1 task's data at a time.

The performance of the core is identical as the performance of non-HT CPUs, but the bottleneck of the front-end is removed, thus giving you the feeling of 30% boost .

CPU can't give 65% to two tasks, cause it doesn't have more than 100% resources.

The thing with FPS comes from the fact that single- or multi-threaded games do not benefit from duplicated architecural states, but from duplicated cores (dual core or more), But HT stucks 2 threads on the same core, instead of spreading them across cores (because the OS doesn't really know 1&2 core together perform slower than 1&3 core).
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Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
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Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 EVO 120  Western Digital 320Gb LiteON DVD-RW CoolerMaster Hyper Z600 
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