Core i7 with HT vs without HT

[htoonthura]

Hello there,

I have core i7 920 stable ( using intel burn test and prime test) at 3.8g. I have turbo mode on but without HT. But, when i turn on ht, it boots to windows, but fails the stress test in a minute. i increase vcore and qpi voltage, but it does not help. i will turn off turbo mode and turn on ht when i get home and run the test again. I do not know it will work.

My question is

do you guys know review sites that compare i7 performance with or without ht option. If the performance difference is not much, i do not need to do the testing again. i would stick to what i have. it is time consuming.

Thanks.

 

[jay2tall]

I've never had much success with Turbo on, it REALLY heats things up. I turned it off and got lower temps and stable with a higher voltage and BLK.

Hyperthreading is a great feature on the i7. I'd personally rather have HT on and a lower clock than HT off and a few extra MHz.

 

[htoonthura]

HT is WELL worth it. Look at the graph below.

http://i234.photobucket.com/albums/ee88/BlackTTC6/deneb_vs_kentsfield_yorkfield_bloom.png

i will try turbo off and ht on when i get back home. see how it goes. I have to push qpi with 20 multiplier. qpi should be withing .5 range of dram voltage. how far can i go? what is the maximum qpi limit?

If i have instability issue, should i up vcore or qpi first. i hate doing that. it is a lot of work. trial and error. you know.

 

[jay2tall]

^
it does? My vDRAM is 1.6 and my QPI is 1.2v

^
I'd up the vCore a notch... WORK? of course it is work, OCing isn't a walk in the park, especially higher OC's. haha

 

[biot3ch]

Seems to me hyperthreading boosts benchmarks and real-world multitasking applications, but it actually reduces gaming performance. If you're a gamer, I'm inclined to suggest turning it off (with the additional bonus of lower core temps).