8800GT voltage mods

[VETDRMS]

Man, this memory sucks. I loosened the timings to Qimonda spec (the stock bios is closer to Samsung 1ns spec - come on partners, put Samsung in the board). And even at 2.075v Mem it craps out real fast at 1044mhz.

That being said I seem to have hit a new problem. The core will not clock over 864mhz. No matter how high I go in the overclock setting in RivaTuner the ROP clock stays at 864mhz.

Anyone else been this high?

[VETDRMS]

Well, the shader seems to like the extra voltage. 2052mhz shader is 100% stable, while the core seems mostly stable at 864mhz. As I mentioned before I can't go any higher with Rivatuner, it will not change ROP over 864mhz.

Shader will run for a while at 2104mhz, but will artifact after a minute or so.

I'm pretty impressed, at 1.315v its rocking!

[Chris']

oh my god thats just sick..thanks for your sharings...gonna get this card soon.

btw: whats the best avaible cooler for 88gt? air cooler, i mean.
and: may it be too risky putting the voltage on something like 1.3v when cooling with air?

thanks for your reply!

[hstuehmeyer2000]

may it be too risky putting the voltage on something like 1.3v when cooling with air?

i would say so

[GoldenTiger]

i would say so

What do you think of say 1.2v-ish? I'm planning on doing the voltmod, but there's no reason to if it's gonna just make it overheat on me and give me no gain that way :p.

VETDRMS, that's bad luck on the memory ... on stock voltage on mine still, and I get up to 2100 (1050) stable easily, haven't tried higher yet.

[dinos22]

you are very lucky with your shader clocks there not to mention core

[dinos22]

no point touching RAM so maybe back down in case you kill it

goes out to finder a soldering iron and 1K VR

what do you guys suggest in terms of soldering irons

i want 1GHz core : and some dice is that too much to ask

[VETDRMS]

Hey, the next step from 864mhz for setting the ROP clock is 918mhz. No go there, instant hard lock. LOL

I am having some memory problems at the moment.

With the high ROP/Shader clock it will artifact at 1000mhz. At 900mhz memory its rocks table. Ran loops of 3DMark at 864/2106mhz at 1.281v with no problem.

If your going to drop some dry/ice LN2 on it, I think 1ghz won't be a problem at all.

Shader will go as high as 2160 mhz now, but will artifact a bit.

Also, Nibitor is reporting some strange memory timings when I try to make changes and flash the bios. The settings don't get set right or Nibitor isn't readin them right, just FYI.

[GoldenTiger]

LOL @ 918mhz being the next step .

Still trying to debate with myself if my cooling will be enough, if so I'm gonna do it .

[NJDevilsFan21]

What are the chances that we see some super easy conductive ink mods?

[VETDRMS]

What are the chances that we see some super easy conductive ink mods?

IMHO the soldering is super easy. LOL


Oh, by the way, I wouldn't waste your time with the vMem mod. The Qimonda chips on my board at least hate high VDD, most likely due to the VDDQ voltage being tied in with VDD. Even at 2.020v it would freak out at 1000mhz. I unsoldered the VR and now at 1.995v (stock form EVGA is high for some reason) the memory is fine at 1000mhz.

So, final stable clock for now in games/3DMark ect is 864/2106/1000.

[oohms]

What are the chances that we see some super easy conductive ink mods?

Zero, lol, this doesnt use the same method that the 7900gt/gs use

Hey how hot do the voltage regulators get when you run 1.3v GPU?

[GoldenTiger]

Nice .

I really want to do this mod, but not positive my cooling'll handle it. Take a look and let me know ? Also, should I sink the MOSFETs/etc.? I'm hitting pretty good clocks but I'm wondering if doing so would let me get further, especially if/once I do the vGPU mod.

[theteamaqua]

nice, but i intend to keep my warranty, therefore no vmod...

unless there is a pencil vmod , which is irreversible

[uwackme]

Proper soldering iron would be Weller EC3001 or equivalent.

Source in US for parts... pots, etc is Digikey.

Go to Radioshack and get some KYNAR 30ga rework wire. Use it for these things. Makes for much cleaner work, and easier to work with SMD. Also, look into getting a nice magnifying ringlight, makes it alot easier to work on tiny SMD stuff.

[VETDRMS]

GoldenTiger:

I don't think 1.175 or 1.200v would be a problem, those are some decent heatsinks. My stock SSC was 1.137 on the single slot cooler.

Unless you like the smell of roasted mosfet I would advice you install some sinks on them. They do get pretty hot and when you up the voltage they will get much hotter. The copper sinks on my mosfets get up to around 122F.

So, what kind of clocks are you getting???

[NJDevilsFan21]

Zero, lol, this doesnt use the same method that the 7900gt/gs use

Hey how hot do the voltage regulators get when you run 1.3v GPU?

Damn, but conductive ink... if you ever destroy the card you pull out the acetone and bam it never happened!

I want to put the FC-ZV9 that I have on my 7900GT, but I have to break 75C with stock cooler, fan set to 70% with 720/1836/2000 clocks at 73F room temp. I just don't have any extra ram sinks for the mosfets.

Unless you like the smell of roasted mosfet I would advice you install some sinks on them. They do get pretty hot and when you up the voltage they will get much hotter. The copper sinks on my mosfets get up to around 122F.

You are also running 864MHz on the core and 2100MHz shader!!

Right now the only possible vmod for me is if that BIOS soft mod from 1.05V to 1.1V actually works, or else I'll just forget about it. Crysis now runs well all settings high, that's all I care about.

[GoldenTiger]

GoldenTiger:

I don't think 1.175 or 1.200v would be a problem, those are some decent heatsinks. My stock SSC was 1.137 on the single slot cooler.

Unless you like the smell of roasted mosfet I would advice you install some sinks on them. They do get pretty hot and when you up the voltage they will get much hotter. The copper sinks on my mosfets get up to around 122F.

So, what kind of clocks are you getting???

Music to my ears .

No, thank you, but I prefer french vanilla coffee if anything has to roast :p . I'll remount and put sinks on those MOSFETs tomorrow , and do the mod soon (getting a new PSU in to make sure I'm not being power-limited, seems iffy).

The max clocks I can do right now are 736/1836/2100 core/shader/ram in SLI... I have a feeling more power would help, because if I overclock even one ROP notch above this, the screen goes black, flickers on a couple seconds, etc., seems like a power issue even on the overclock limiting me, let alone the system/performance.

Damn, but conductive ink... if you ever destroy the card you pull out the acetone and bam it never happened!

I want to put the FC-ZV9 that I have on my 7900GT, but I have to break 75C with stock cooler, fan set to 70% with 720/1836/2000 clocks at 73F room temp. I just don't have any extra ram sinks for the mosfets.

You are also running 864MHz on the core and 2100MHz shader!!

Right now the only possible vmod for me is if that BIOS soft mod from 1.05V to 1.1V actually works, or else I'll just forget about it. Crysis now runs well all settings high, that's all I care about.

Haha, I guess that's one way of thinking of it ! I have RAMsinks since they came with my coolers, they're perfect height too ... didn't own any otherwise, but each ND1 came with 4, so that's plenty. I bet having those high clocks sure help the power circuitry heat up. As far as the BIOS soft-mod, it turns out 1.05v is "idle" and 1.1v is "3d-mode" normally, so there is no soft-mod currently thought of.

[GoldenTiger]

Just ordered a nice, hefty PSU, it should be here Tuesday, which is when I'll probably do the voltmod, if I can push the CPU up easily . Otherwise I'll do it later once I've sorted that bottleneck out.

Getting this one: http://www.newegg.com/Product/Produc...82E16817139006

[Lastviking]

Anyone know if all brands use Qimonda mems on all 8800 gt cards? , and i wonder one more things also can a new bios or something remove the big overclocking steps?. The clocks steps are realy to big.

GoldenTiger what psu do you using? and are you trying to clock in sli?

[largon]

Clock steps, I believe, are what they are because of the clock crystal used on the board. No amount of BIOS modding will change that. Only would be to desolder the stock crystal and replace it with a smaller one and voilá; you got lower steps.
The crystal on GT looks like an all-metallic rectangle chip and it's located near the GPU, just by it's left side.

[Marco André]

Impressive grapich card! Congratz to all for the results

[theclash]

864 core and 2000+ on shader?!?!?

maybe I'll have to retire my 6800 after all

[pinto]

Hi,

Stock cooling with 1.180v i break the 16K barrier:




only 70°c with fan at 100%

[trans am]

Just ordered a nice, hefty PSU, it should be here Tuesday, which is when I'll probably do the voltmod, if I can push the CPU up easily . Otherwise I'll do it later once I've sorted that bottleneck out.

Getting this one: http://www.newegg.com/Product/Produc...82E16817139006

waste of money. You would've been better off with this single 12v rail@ 41A
http://www.newegg.com/Product/Produc...82E16817139004