Please post 7900GT / GTX overclock results

[HeavyH20]

XFX 7900 GTX 512 Extreme Edition 710/1800
stock cooling
x2 4400+ @ 10 * 250

3D05 11509
3D06 6312

Which one do you have? The 675 cored version? If so, you may want to edit the BIOS so that you can restore the delta back to 50 MHz from 25 MHz. The ROP/Shader is often the limiting item, not the vertex. Mine is now at 60 MHz and it has improved things. I have the regular EVGA 7800 GTX.

at 729/910

3D05 12605
3D06 7006

[vocch]

Does anybody know if the XFX 7900GT XXX version use any other memory than the other Xtreme versions?

Don't think so...as i've seen peeps flashing xxx bios to xe's.

[Nilson]

12K done!

750 + 20 MHz / 1820
1.6V core / stock mem voltage.


Attachment 45454

Best bang for the buck

Nope. Your G71 skips some GPU cycles.

12.1k can be done with 720/1930 delta +20 with only one core CPU AMD 3700+@2950. Two cores adding a lot of marks.

This issue can be related to overheating mosfets or overclocking GPU blocks. Check your elements in circuit. Try negative delta. We are trying to find the root cause in our thread on overclockers.ru.

I can say that you should be able to get on your system: ~12.2k mark05 and ~6700 mark06 only with 720/1800.

[MsB]

I have two evga co's and with the 4v mod I can get 640/1800 on either with stock cooling and no ramsinks. each will break 10k on 3dmark05 but when I run them in sli the best I can get is 560/1740. The reason is if I try to approach 600 on the gpu the system hangs or shuts down.
WTF I have a thermaltake 520 watt pure power PS. Its either getting to hot because of sli or power issues?? Im getting the new 7900 gt sli waterblocks that Danger den is coming out with in the next couple weeks and will fix the prob if its heat but Im kinda stumped. What do you guys think? anything I should try to isolate the issue?

[alpha0ne]

Sounds like PSU, the thermaltake 520 watt, like all Tt PSU's is a POS

[PcCI2iminal]

stock cooling

[mascaras]

VGA: single XFX 7900GT XT (520/1500)@ 660/1740 ---- 1.40 VMod/ Ram (NO Vmod)
DRIVER: 84.21 oficial
CPU: Opty 148@ 2990Mhz
SCORE: 10942





XFX 7900GT XT @660/870 // 1.40v MOD

[Dazog]

7900 GT 700/1860 1.55v

[neoman]

Dazog: pump your X2 3800 up to 2800mhz if you can. And see the score rise

[jVIDIA]

Is it safe to use the 1.4v mod 24h a day with water cooling ? and 1,5v ?

[Nilson]

Hey Dazog, just look at mascaras result - almost 11k with one core and a little bit low clocks.... it's realy strange...

[Nilson]

jVIDIA, yep 1.4 and 1.55 it's safe for water cooling...

[Mr.Kakarot]

So out of all of these resutls, which is the best SLI set up?

2 gts superclocked or regulars overclocked
2 gtx superclocked regulars overclocked

I want to order today, my superclocks have been on back order for over 2 weeks! Was thinking of getting the regular ones.

Or maybe saving a bundle and getting 2 gts, overclock them

thanks

[Ebola]

I'm minding of switching the voltage to 1.7V like Shamino did, but isn'tit too much for a H24 use, i mean with a fan blowing on regulator and RAM and witg GPU under waterchiller.

The gain seems important but i fear somehow the enormous voltage considering the original 1.2V -> 1.7V +41%

[Mysterfix]

I'm minding of switching the voltage to 1.7V like Shamino did, but isn'tit too much for a H24 use, i mean with a fan blowing on regulator and RAM and witg GPU under waterchiller.

The gain seems important but i fear somehow the enormous voltage considering the original 1.2V -> 1.7V +41%

But consider that the nominal voltage for the GTX is 1.4v and these are the same cores. It's just that the GT's have been starved for voltage to keep the clocks lower then the GTX's. It is a smaller core though, so maybe keep it at 1.6v to be safe.

[Ebola]

But consider that the nominal voltage for the GTX is 1.4v and these are the same cores. It's just that the GT's have been starved for voltage to keep the clocks lower then the GTX's. It is a smaller core though, so maybe keep it at 1.6v to be safe.

Right gonna try 1.7V then for few bench

Can stand out at this frequencies anymore juste too low voltage @ 1.5V

[Dazog]

Hey Dazog, just look at mascaras result - almost 11k with one core and a little bit low clocks.... it's realy strange...

could be driver differences

[Dazog]

Dazog: pump your X2 3800 up to 2800mhz if you can. And see the score rise

I will push it to 3000 soon, been to busy messing with the 7900GT first

[jVIDIA]

Folks,

D511 + Ground will give 1,4v
D511 + D508 + Ground will give 1,5v

and only D508 + Ground will give 1,3v ???!

and in the 1,5v mod, D511 and D508 must touch each other or they can be separated and connected to the ground individualy ?

[mascaras]

11K done with 1,40vMod and only with 670Mhz Core and 870 memory @ opty 148 single core@ 2990mhz:

[Mysterfix]

Right gonna try 1.7V then for few bench

Can stand out at this frequencies anymore juste too low voltage @ 1.5V

Those are some killer clocks I hope mine does that well, I get it tomorrow so wish me luck.

[madgravity34]

After seeing your oc's, it proves that the gtx's really do have the higher binned cores. With 1.4v the gtx's hit around 700+ and that with 50 gdc is 750 @ 1.4v. A lot of you guys cant get close to that with 1.4v and most need 1.5v. Correct me if I am wrong.

[Mysterfix]

After seeing your oc's, it proves that the gtx's really do have the higher binned cores. With 1.4v the gtx's hit around 700+ and that with 50 gdc is 750 @ 1.4v. A lot of you guys cant get close to that with 1.4v and most need 1.5v. Correct me if I am wrong.

I'll be happy if I can pull 700+ at 1.5v on a $315 video card! I haven't been paying very close attention to the GTX's so I'll just have to take your word for it.

[***Deimos***]

Nope. Your G71 skips some GPU cycles.

12.1k can be done with 720/1930 delta +20 with only one core CPU AMD 3700+@2950. Two cores adding a lot of marks.

This issue can be related to overheating mosfets or overclocking GPU blocks. Check your elements in circuit. Try negative delta. We are trying to find the root cause in our thread on overclockers.ru.

I can say that you should be able to get on your system: ~12.2k mark05 and ~6700 mark06 only with 720/1800.

If you are refering to the small difference in scores, and why his 7900GT cant score as well as GTX:
7900GTX != 7900GT. For starters 256MB vs 512MB. Perhaps different timings. Delta clock. Did both use LOD tweak? Same driver, set to high performance? And ofcourse, each system is setup different. Anyway, his scores look ok to me.

I'm minding of switching the voltage to 1.7V like Shamino did, but isn'tit too much for a H24 use, i mean with a fan blowing on regulator and RAM and witg GPU under waterchiller.

The gain seems important but i fear somehow the enormous voltage considering the original 1.2V -> 1.7V +41%

744Mhz @ 1.5V .. WOW
Unless you are (obviously) trying to break into the 3DMark top10 or something, and have the pre-requisite Dry-ice/phase-change to go along with the 1.7V (if you're going after top scores, you gotta do it right), then what's the point. Look at Shamino's results at www.vr-zone.com. Very similar to yours. But pushing 1.7V he couldn't even get 800Mhz fully stable... ie.. diminishing returns.

Folks,

D511 + Ground will give 1,4v
D511 + D508 + Ground will give 1,5v

and only D508 + Ground will give 1,3v ???!

and in the 1,5v mod, D511 and D508 must touch each other or they can be separated and connected to the ground individualy ?

D508 alone is +0.1V increase (as stated already multiple times), thus 1.3V for 7900GT.

Connected.. seperated... does ground discriminate between D508 and D511? Does it matter if you connect D508 to ground, or ground to D508? Get what I'm saying?

A "ground" is a "ground", and all connected to "ground" is also "ground". So, after you connect ground to D508, now D508 is also ground. If you connect D508 to D511, D511 will also be at ground. It doesn't matter how you connect them, as long as you connect those points on the PCB and those points only.

and for future reference, jVIDIA, please read the volt-mod thread first.. save your time, and our time

[***Deimos***]

After seeing your oc's, it proves that the gtx's really do have the higher binned cores. With 1.4v the gtx's hit around 700+ and that with 50 gdc is 750 @ 1.4v. A lot of you guys cant get close to that with 1.4v and most need 1.5v. Correct me if I am wrong.

you are right.
but "only" 640-660Mhz @1.4V is still really good... its still 40% more. Its a good thing the quality of the chips is so high. For a while I was worried, that they truely could only do ~450Mhz... nobody would be happy then :wink:

RE:1.7V - dont be fooled into thinking its just 0.3V over GTX 1.4V. For starters, 1.4V is already at or over the maximum rated for 90nm. No big surprise that compared to 1.2V-1.4V, raising voltage over 1.5V gives very little extra Mhz. Also remember, power and heat do not scale linearly, but approximately quadriatically... ie 1.4V->1.7V = 38% more heat/power! And dont forget all the power regulation circuitry under all that stress. 1.7V certainly not advised for 24/7, but would make good screenshots especially with LN2