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Looking for someone with i3 - Page 3

post #21 of 24
Quote:
Since the L3 cache speed of Haswell and later Intel architectures is once again separate from core clocks, a mild underclock on the uncore can make a pretty convincing i3 out of a mainstream i7.

Not really, considering the L3 cache speed and bandwidth are very different. Many tasks/games don't care about L3 amount much if at all, some others are probably influenced by having twice as much L3 available per core.

Other games/programs respond to cache performance but not amount - underclocking cache below i3 clock speeds could make i7 then perform lower than i3

The biggest problem here comes when you take a 5960x and try to emulate a pentium g3258 - there is a HUGE difference in cache sizes and even the memory subsystem. It's pretty hard to do - mainstream i7 with 2 cores disabled is usually pretty damn close to i3, however. The performance-per-clock difference between architectures is usually far, far greater than the scaling for additional L3 cache (if it's there at all)

@OP - WoW and Starcraft 2 both have free starter editions and don't scale to 5+ threads well if you would like to bench there
Edited by Cyro999 - 9/26/15 at 9:50pm
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post #22 of 24
Quote:
Originally Posted by Cyro999 View Post

Not really, considering the L3 cache speed and bandwidth are very different. Many tasks/games don't care about L3 amount much if at all, some others are probably influenced by having twice as much L3 available per core.

Other games/programs respond to cache performance but not amount - underclocking cache below i3 clock speeds could make i7 then perform lower than i3

The overall difference isn't far off and most programs that benefit from more cache benefit from faster cache. There are some outliers, but that's the trend.
Quote:
Originally Posted by Cyro999 View Post

The biggest problem here comes when you take a 5960x and try to emulate a pentium g3258 - there is a HUGE difference in cache sizes and even the memory subsystem. It's pretty hard to do - i7 with 2 cores disabled is usually pretty damn close to i3, however. The performance-per-clock difference between architectures is usually far, far greater than the scaling for additional L3 cache (if it's there at all)

Yes.
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post #24 of 24
Quote:
The overall difference isn't far off and most programs that benefit from more cache benefit from faster cache. There are some outliers, but that's the trend.

I agree, more variables are hard though

IMO there should be little focus on GPU benches when looking at CPU performance differences. They're typically designed to hammer the GPU with minimal CPU demand while most of the games that struggle on an FX or a Skylake CPU willl not be like that at all.

For a quick overview of those games, mostly a ton of rts/mmo's + some other large scale games like planetside 2 or things with a lot of physics simulation like kerbal space program

GPU bound games or being stuck at lower FPS with GPU at 100% load because of your personally chosen settings will reduce or entirely remove the performance difference seen in CPU's, so it's way more relevant for somebody trying to play at 150fps vs someone who's happy at 30. There are quite a few games that are just so CPU heavy that you'll easily be CPU bound no matter what you're running though
Edited by Cyro999 - 9/26/15 at 10:00pm
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