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Has anyone tested the 9900 temperatures with HT disabled?

Machinus

Member
Mar 28, 2006
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I would be very curious to see a comparison of the 9700 vs. the 9900 with HT disabled, specifically power draw and temperatures.

Has any site done a benchmark like this?
 

Dave3000

Golden Member
Jan 10, 2011
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Doesn't that make it the 9700k? 8 cores, 8 threads?
Not exactly. The 9900k still has 4 MB more of L3 cache and a little higher turbo boost than the 9700k. Hyperthreading with 8 cores does nothing for gaming currently and the higher clocks only make it a few percent faster than the 9700k in the gaming benchmarks shown in recent reviews. What would be the point in buying a 9900k instead of a 9700k if you are going to disable hypertheading?
 

Shmee

Memory and Storage, Graphics Cards
Super Moderator
Sep 13, 2008
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As you just said, the 9900k has more cache, and if not OCing, it will turbo higher. If you are overclocking, I suspect the cache would not matter? or would it? Suppose both OC settle on 5GHz with 8c8t, how much faster is the 9900k due to extra cache?
 

ZGR

Golden Member
Oct 26, 2012
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Not exactly. The 9900k still has 4 MB more of L3 cache and a little higher turbo boost than the 9700k. Hyperthreading with 8 cores does nothing for gaming currently and the higher clocks only make it a few percent faster than the 9700k in the gaming benchmarks shown in recent reviews. What would be the point in buying a 9900k instead of a 9700k if you are going to disable hypertheading?
I play Rainbow 6 Siege and 4c4t CPU's get around 50 FPS lower than 4c8t CPU's in Terrorist Hunt (max CPU load).
 

CHADBOGA

Platinum Member
Mar 31, 2009
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I play Rainbow 6 Siege and 4c4t CPU's get around 50 FPS lower than 4c8t CPU's in Terrorist Hunt (max CPU load).
He does say "Hyperthreading with 8 cores does nothing for gaming currently".

When you only have 4 cores, it is not so surprising if Hyperthreading helps in certain games.
 
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ZGR

Golden Member
Oct 26, 2012
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He does say "Hyperthreading with 8 cores does nothing for gaming currently".

When you only have 4 cores, it is not so surprising if Hyperthreading helps in certain games.
I have tested R6 on a 14c xeon, and HT didn't add such a considerable boost; but was still there. Clockspeed was also much lower, memory speed was much lower, and I was rather unimpressed with performance as a whole. I would love to see more R6 Terrorist Hunt CPU benchmarks. No matter how many cores you throw at it, it will report near 100% usage on each core. It isn't actually 100% usage, but it is pretty funny to see.

Keep in mind, the only mode on R6 that loads in enough terrorist at spawn in Disarm Bomb, and barely anyone plays that.
 

Dave3000

Golden Member
Jan 10, 2011
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I play Rainbow 6 Siege and 4c4t CPU's get around 50 FPS lower than 4c8t CPU's in Terrorist Hunt (max CPU load).
Are you sure it's not because of the combination of a larger L3 cache, faster clock speeds, and hyperthreading on the 4-core CPU, and not just because of hyperthreading accounting for the increased performance in the game?
 

ZGR

Golden Member
Oct 26, 2012
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Are you sure it's not because of the combination of a larger L3 cache, faster clock speeds, and hyperthreading on the 4-core CPU, and not just because of hyperthreading accounting for the increased performance in the game?
Absolutely positive. I have tested this game on a wide variety of CPUs, some where the i5 has larger L3 than the i7, and where the i5 is clocked significantly higher.

I have also tested with hyperthreading disabled. The highest core CPU I used for R6 was a 14c/28t Xeon. Disabling HT has a negligible performance drop, but still there. I think having 8 cores without HT would be perfectly fine.
 

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