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View Full Version : XFX 6800GT to ULTRA


radekhulan
04-02-05, 01:52 PM
FYI: I tried flashing XFX 6800 ULTRA BIOIS to 6800GT card, core clock went from 380 Mhz to 425 MHz, but the performance was VERY unstable, even after increasing AGP voltage.

Seems like the stable speed for my XFX 6800GT (with GT BIOS) is 400/1150, even 401 cannot be met.

This said, there *is* a HW difference between GT and Ultra cards. Not that I would care that much, as already now 3DMark05 is at 5,333 points, and FPS at Doom 3 with 1280x1024, AF 8x, AA 4x does not fall below 70 :-)

JoKeRr
04-02-05, 03:17 PM
come back when your GT is dead

SH64
04-02-05, 03:28 PM
First i dont advice in BIOS flashing to Ultra .. you may try overclocking & stay with the most stable clocks .
second more than 400/1100 for a GT is overkill .. you are risking damaging your video card by what are you doing . heck even 400/1100 is not advisable if you dont have very efficient cooling .

third , the differences between the GT & Ultra -if i'm not mistaken- are the cooling solution , the voltage , core/mem clocks (of course) & in some cases the memory modules latency .

jAkUp
04-02-05, 03:36 PM
The memory latency, and also remember that the 6800 Ultra requires 2 molex connectors

brady
04-02-05, 03:53 PM
i thought all GT's required 2 molex connectors...mine does anyway...

saturnotaku
04-02-05, 03:59 PM
i thought all GT's required 2 molex connectors...mine does anyway...

The Asus GT does, not the eVGA you claim to have.

radekhulan
04-02-05, 04:38 PM
heck even 400/1100 is not advisable if you dont have very efficient cooling

I do have a great cooling, changed stock one for ZALMAN VF700-Cu, temp is down from 62C to 50C in 2D, and about 10-15C more @ 400/1150.

Played Doom 3, Chronicles of Riddick and HL2 with no glitches whatsoever :-)

PeterJensen
04-02-05, 04:57 PM
400 on the core risky for a 6800GT...hmm i am glad i bought a Asus 6800GE then...take a look in my sig.

PeterJensen
04-02-05, 04:58 PM
But the 6800GE does have 2 molex connectors.

SH64
04-02-05, 05:03 PM
Played Doom 3, Chronicles of Riddick and HL2 with no glitches whatsoever :-)

Well if every game is running stable with you on 400/1100 thats great ... you dont really need to risk going higher.

as for artifacts .. they could be coming from your memory clock rather than core clock . try something like 405-410/1100 (no more than 1100) & see if you still get artifacts .

XP_GUN
04-02-05, 05:11 PM
400 on the core risky for a 6800GT...hmm i am glad i bought a Asus 6800GE then...take a look in my sig.

Really :bleh: im running mine at 415 without a vote mod, just overclocked and no problems what so ever. Most GTs do 400 with overclocking and have no problems.

PeterJensen
04-02-05, 05:13 PM
First i dont advice in BIOS flashing to Ultra .. you may try overclocking & stay with the most stable clocks .
second more than 400/1100 for a GT is overkill .. you are risking damaging your video card by what are you doing . heck even 400/1100 is not advisable if you dont have very efficient cooling .

third , the differences between the GT & Ultra -if i'm not mistaken- are the cooling solution , the voltage , core/mem clocks (of course) & in some cases the memory modules latency .

XP_GUN : i dont have a GT, and i was replying to SH64. Also what is a "vote mod" :p

XP_GUN
04-02-05, 05:16 PM
lol I mean volt :p also I really dident read all of it.

I was thinking about incressing the volts on my card but dident want to burn it out

http://forums.extremeoverclocking.com/showthread.php?t=126632&highlight=edfx

SH64
04-02-05, 05:23 PM
Generally speaking its not good to take your 6800GT out of the box & run it @Ultra clocks just like that . as with any other GPU/CPU its best to go step by step until you get highest stable clock which might become different for PC to another (depending on the cooling & the other factors)
that what i was refering to .
yeah i did overclock my previous 6800GT , but it had a custom copper cooler & a fan speed controler ... so i set the speed to max , gone to 375/1050 .. then went to 400/1100 which was stable for me . i was going to give it more tests when suddenly i had to sell it & get a dual 6800GTs PCI-E :p .
i'm now even afraid of going 375/1050 when i look at the temps of the 2 GPUs .. i think i'll leave that idea for the time being until i get better cooling for my case.

radekhulan
04-02-05, 05:34 PM
400 on the core risky for a 6800GT...hmm i am glad i bought a Asus 6800GE then...take a look in my sig.

Why would it be risky? I thought the GT core is the same as Ultra core, and Ultra is clocked at 425 stock, thus taking GT to 400/1150 does not mean any problems, right? Well, I do not *see* any problems in games, except great performance "problem" :)

saturnotaku
04-02-05, 06:53 PM
I thought the GT core is the same as Ultra core, and Ultra is clocked at 425 stock, thus taking GT to 400/1150 does not mean any problems, right? Well, I do not *see* any problems in games, except great performance "problem" :)

If the GT core was the same as the Ultra, don't you think the card makers would sell it as such? They don't say to themselves, let's be extra nice to gamers and bin this Ultra chip as a GT so they can get Ultra performance without paying the $100 price premium. We wuvs them!

And stock speed on most Ultra cards is 400/1100. XFX overclocks theirs, and not very well as I had one and I had to downclock it to get it to work properly.

radekhulan
04-02-05, 07:01 PM
If the GT core was the same as the Ultra, don't you think the card makers would sell it as such?

Well, I suspect that every chip made is a bit different, so, if it passes successfuly all tests at, let's say 420 MHz, it is Ultra, otherwise, it is GT. But there is always a potential that with good cooling GT will become an Ultra. My own card did :)