eVGA 7900GT C0 SuperClocked babies

eva2000

eva2000

Gawd
Joined
Apr 14, 2002
Messages
539
All straight out of the box, stock heatsink fan and NO volt mods.

7900GT_001.JPG

7900GT_015.JPG


Test used: continous looping of 3dmark2003, 3dmark05 and 3dmark06 along with ATI Tool 0.25 beta 14 stress testing.
Overclocking tool used: ATI Tool 0.25 beta 14

Forceware 84.21WHQL drivers used.

Room ambients: 26-31C night-day temps.

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1st eVGA 7900GT C0 Superclocked
- bios 5.71.22.14.04 dated March 9, 2006 see pic here. I dumped the bios and uploaded it here if anyone wants it.
- stock speeds = 550/1580
- Samsung BC14 1.4ns 610 (week 10, 2006) memory chips
- manages 590-595mhz on core and 1860 on mem fine when load temps are 63-66C which are close to same load temps at stock 550/1580.
- it managed 600/1860 when ambient temps dropped allowing 58-61C load temps but when load temp rises past 62+ it can't do 600/1860



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2nd eVGA 7900GT C0 Superclocked
- bios 5.71.22.14.04
- stock speeds = 550/1580
- Samsung BC14 1.4ns 610 (week 10, 2006) memory chips
- doesn't seem as good as first card looping 3dmark05 already hit a limit on core - not passing at 590(610)mhz so far with 63-65C load temps
- limit of this card on the core seems to be 580-583mhz core and 1840mhz on memory with 62-65C load temps which are close to same load temps at stock 550/1580

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3rd eVGA 7900GT C0 Superclocked
- bios 5.71.22.14.04
- stock speeds = 550/1580
- Samsung BC14 1.4ns 610 (week 10, 2006) memory chips
- has consecutive serial number with the 2nd card
- lowest load temps of the three eVGA 7900GT CO SC cards, @550/1580 load temp is 61-62C, idle temps around same 44-46C
- this card has similar core clocks to that of 2nd card but slightly better on core, around 585-595mhz core on this card and 1880mhz on memory

Looks like i'll be matching 1st and 3rd cards for SLI fun :)
 
Looks like they speedbin for at just above 5% over on the core. Nice work. I rma'd my evga 7800GT after it had problems with the memory. It ran a hot 46c on load with watercooling and 40c idle. The new card they sent me run 37c and 40c loads and overclocked 20mhz higher on the core and 30 mhz higher on the memory. So same cores can have significant differences on temps. I hope my 563 model hits your speeds. Let us know what you get when you volt-mod it.
 
won't be doing a volt mod for a loooooooong time and that would be a maybe too heh

Here's 1st eVGA 7900GT CO SC card with some overclocking

@stock 550/1580
3dmark05 = 9,830
3dmark06 = 5,588

3dmark05 @589/1880 = 10,781
3dmark06 @590/1892 = 6,005

Scacrificed 5-6mhz on GPU core for 20-32mhz more on memory heh

All stock heatsink no mods :D
 
here's very first 2x 256MB eVGA 7900GT CO SC SLI @stock 550/1580 with cards #1 and #3

3dmark05 = 13,937
http://service.futuremark.com/compare?3dm05=1954630



Strange though see in pic my control panel with 84.21WHQL drivers in SLI mode, the temperature display option has gone missing ?

3dmark06 = 8,704





System specs are as follows:

FX-60
DFI NF4 UT SLI-DR R.AB0 1114-3 bios
2x1GB OCZ PC4000EB Platinum capable of 275-278mhz 3-3-2-5 3d/gaming
4x 80GB Hitachi 7K80 SATAII NCQ raid 0
1x 250GB Maxtor Maxline Plus PATA
Pioneer DVD-ROM
FDD
1KW PC Power & Cooling SLI psu

20" BenQ FP2091 1600x1200 LCD monitor on Aten CS-84A KVM switch (analogue)

WinXP PRO SP2 latest updates
6.70WHQL NF4 chipset drivers
84.21WHQL Forceware drivers downloaded today from guru3d.com

Oc'd more in SLI

@590(610)/1827 = 9,683
http://service.futuremark.com/compare?3dm06=245316



@590(610)/1827 = 15,625
http://service.futuremark.com/compare?3dm05=1954967

 
Impressive teaser ! I definately want to take a closer look at this later to see your specs against that gtx. I'm going sli with the 500/1500 model hopefully soon.
 
Thanks

Interesting i swapped the 2 cards around in SLI, so #3 card in PCI-E #1 and #1 card in PCI-E #2 slot furthest away from cpu socket, and idle temp reported by ATI Tool is 3-5C lower than with card #1 in first slot

Definitely card #3 runs way cooler than the other two and SLI proves it....

single card max
card #1 = 595-600mhz core and 1860mhz mem (can do 1880-1892mhz mem if i drop core to 590mhz)
card #3 = 585-595mhz core and 1880mhz mem

SLI max (PCI-E slot 1/2)
card #1/#3 = 590mhz core and 1827mhz mem (> 1827mhz mem will result in lower 3dmark06 HDR/SM3.0 scores)
card #3/#1 = 585mhz core and 1840mhz mem (this config results in 6C cooler load temps then card #1/#3 config!)
 
dude.. I am so getting 7900GTs... they're performing and OCing so well.. not worth the extra moola for the GTX imo..
 
well i guess my 7800GTX 512 is a OC'd 7900GT CO SC with extra ram that wishes it could do 1880mem
 
My eVGA 7900GT CO SC is a lemon. :( It's only marginally stable at 550mhz core, and 500mhz memory(1ghz). Still some artifacts, but atleast it doesn't blink the screen and crash completely...
 
okay strange i'm getting same 3dmark06 deep freeze locks http://www.evga.com/community/messageboard/topic.asp?TOPIC_ID=14044 ever since i changed from 84.21WHQL drivers to 84.43 beta drivers... it happens even at stock 550/1580 speeds single card and sli. No probs with 84.21WHQL initially but now changing back to 84.21WHQL i get same tearing/lock up at stock 550/1580 speeds ??? :confused:

with 84.43 beta drivers, in winxp event viewer i see
nv: silent running: rising temperatures caused level transition from L2 -> L1
nv: silent running: rising temperatures caused level transition from L1 -> L0
Click to expand...

i don't get this message with 84.21WHQL but still get 3dmark06 deep freeze tearing

??

edit: confirmed this issue is happening on card #1 (the best clocker too :( ) no probs so far with card #3 and 3dmark06
 
plucked in card #2 and looping 3dmark06 at stock fine so far... so looks like card #2 and #3 with consecutive serial numbers in low ending 4 digits of 2170s are fine and only card #1 has tearing issues at end of 3dmark06 deep freeze loop tests.
 
damn, nice.

hmm why doesn't the RAM have any heat sinks on it? What kind of RAM do they use in 7900 that doesn't require cooling, how is it different than the RAM on 7800?
 
ChingChang said:
damn, nice.

hmm why doesn't the RAM have any heat sinks on it? What kind of RAM do they use in 7900 that doesn't require cooling, how is it different than the RAM on 7800?
Click to expand...

They're Samsung 1.2ns RAM I think. 610 is the number on mine, so they were made the 10th week of 2006. Which puts it in one of the first batches.
 
Bona Fide said:
No RAMsinks? Isn't that a bit dangerous? :confused:
Click to expand...

nope, the lower voltages = lower temps, haven't heard of anyone with temp probs even while OCing, if it is bothersome you can always buy ram sinks, I just find them pointless though
 
fromage said:
They're Samsung 1.2ns RAM I think. 610 is the number on mine, so they were made the 10th week of 2006. Which puts it in one of the first batches.
Click to expand...

7900GTs use Samsung 1.4ns and 7900GTXs use Samsung 1.2ns. I'm surprised though how the 7900GTs are typically getting 1800+ MHz with 1.4ns RAM, which has tigher timings than the 1.2ns RAM.

KompressorV12 said:
nope, the lower voltages = lower temps, haven't heard of anyone with temp probs even while OCing, if it is bothersome you can always buy ram sinks, I just find them pointless though
Click to expand...

Well the RAM, unlike the GPU core, doesn't throttle so if they are getting too hot because of OCing/volt mods then they will just burn out and die whereas the GPU core will throttle/lock up before it gets too hot.
 
actually ram does get kinda hot 48-52C approximately using infra-red thermometer, but with 120x38mm fan over the cards it keeps them upto 8-10C cooler :)
 
The_Dark_Abyss said:
7900GTs use Samsung 1.4ns and 7900GTXs use Samsung 1.2ns. I'm surprised though how the 7900GTs are typically getting 1800+ MHz with 1.4ns RAM, which has tigher timings than the 1.2ns RAM.
Click to expand...

I have run my memory at 500mhz(1ghz) so that it won't fucking crash.
 
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