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8800gtx needs voltage?

post #1 of 10
Thread Starter 
Hey people.

I'm fairly new to this overclocking business, but after reading much I have given my bfg 8800gtx oc (core-600; shader-1404; memory-900) a shot.

My temps on stock frequencies, cooler and fan speed are 54-56 idle, 77-80 load.
Now, I've searched a lot, and while some people boast better temps, some of them don't mention the fan settings or possibly the use of after market cooling, so I'll go ahead and consider these temps normal, since that appears to be the case for most people with everything stock.
And since the card is pre-oc the temps are ok I guess.

After some early tests with ntune I couldn't go over 621mhz on core. Again this seems to be the case with lots of people, except cases with aftermarket cooling.

Switched to riva tuner for oc and ati tools for stress test.
Found out about the overclocking by steps with the gtx (core oc steps- 594, 612, 621, 648)
Downclocked the shader for more head room (good method according to some guys) and left memory stock.
Still no luck over 621 on core.
Haven't tried this slight mhz increase to the PCI-E I've been reading about. I also red it should be locked at 100; anyways:

At 621 core after 10 min in ati tools, with stock fan at 100% and 120mm case side fan right next to card expelling air I got 49 idle and 68 load.
At 648 the system hanged almost immediately after ati tools, it didn't even had time to warm up.


Now, I understand the next step in core oc in vicious (621-648), still the temps with the fan 100% should give me some space right?

Since temps don't seem to be the main factor my big question is:
Is this a voltage thing?

I really wanted to push the card a bit more.
If it's air I'll get a better cooler, if it's voltage I won't volt mod so it'll be settled.

My card is also making the wheezing sound on game menus (high FPSs/capacitor thingy?), so maybe I'll RMA the card in the hopes of fixing this and maybe get something more overclockable

some other system specs: ABIT AB9, 650 seasonic PSU, e6700 oc'd to 3200, dominator 6400 memory, antec 900 case, xp pro 32 SP2, nvidia drivers 169.21 (if i'm not mistaken)

Some hints guys?...
post #2 of 10
You're about at the limit for the GTX OC. If you have a vanilla GTX (non-superclocked, about 660 core in ATI tool is the max most of us can reach). I don't recall what my actual clocks were, but I think it was about 661/1050 core/mem, artifact free for 30min.

You might be able to gain a few more mhz by playing with the PCI-E freq (100-110), but I think the only way to increase voltage is the flash the card's BIOS or do a volt mod. Although to be honest, you're looking at minimal gains past your current OC. You can do the pencil volt mod to increase the memory OC, but that's up to you.
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post #3 of 10
Thread Starter 
Thanks for the quick reply.

So I guess brand plays a role here. Checks out with the numbers I've been reading for the bfg 8800gtx oc.

I was thinking of buying the accelero 8800
http://www.madshrimps.be/?action=get...62&articID=667
but if temps don't affect performance much I'll stay with stock

Anybody out there that had stock temps like mine saw improvements on overclock after a good aftermarket cooler like the accelero or thermalright HR-03 Plus?
post #4 of 10
My card is watercooled and only hit 52C under load, I still couldn't get past 630 on the core. If your card needs more voltage then it needs more voltage, no way around it. Not that better cooling would be a bad thing though. For what it's worth a volt mod got me just over 700 on the core, so that did help. Still not an amazing card though, it's the luck of the draw, looks like you are about where I was
    
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post #5 of 10
Thread Starter 
The cold truth...
Hope you didn't change to water just to push it

Maybe I'll start thinking about that LEGITIMATE rma...
and wait about two months for it.

Thanks guys
post #6 of 10
Yeah mine seems to top out around 621mhz as well so an increase in voltage and better cooling will probably be needed to bump it up higher.
post #7 of 10
I think your GPU needs a pencil mod, because 850W is just find, pencil mod would be good.
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post #8 of 10
Thread Starter 
Tried to up the pci-e frequency for a more stable overclock; nothing
Return cpu clock to stock; nothing

Down to my last card which I'm pretty sure won't work: bios flash

3 main questions for this one:
-Which one is a good performance bios and where to find them?
-If I the bios flashing process goes wrong is there still a chance to revert back to the original and previously saved bios?
-Can manufacturers find out if a card has been bios flashed if the original bios is put back in and the card is functioning perfectly (apart from the reason for the rma)?

Finnaly: can somebody tell me of a good revision for a 8800gtx? Something that has proven to be a good overclocker.
If you post your overclock, please specify the rest (cooler, fan speed, etc. etc.)

Cheers
post #9 of 10
I intend to run my two GTX's at 600 / 2000 24/7 when i get GTX's again.

Benching would be more obviously. But when I had by BFG 8800GTX OC2 the max I could get artifact free was 6600 Core, 1500 Shader and 2100 Memory.
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post #10 of 10
If the bios flash goes wrong - to the point you cant boot from it ... re-flashing will be pretty complicated. You can reflash if youve got an older board with joint AGP & PCI-E + youll need an old AGP card. Set the bios to boot from AGP instead of PCI-E. And then reflash the PCI-E card using flash commands. Its basically a lot of hassle.

I have recently tried flashing the bios of a hd3870 on dual PCI-E slots and had no luck. Im sure people have done it but I had no luck.

Windows based flashing while booted from a spare card might work.

If youre thinking of RMA'ing the card youve got nothing to lose. I have sent back 2 cards through failed bios flashes. They didnt see id done it, but thats not to say your guys wont. Just deny it all and tell them you are a Christian Minister and you never lie.
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