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SLI with different memory types DDR2 GDDR 9600GT

Last response: in Graphics & Displays
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August 1, 2011 11:52:53 AM

Hi guys,

IM trying to run SLI mode with my two 9600GTs.
One is 512mb Leadtek and the other is a 1GB ECS. I know its fine to run two different memory sizes.
GPU-Z tells me BOTH have the same GPU - G94.

The problem is (and i was only alerted to the fact when i ran GPUz on the new card) is that the ECS is DDR2 and the Leadtek is GDDR3.

Im having trouble getting SLI to run/activate/register at all. Is this due to the two different memory types? Can you not run two different memory types even on the same cards, with same GPUs??

Please let me know.


******* ECS selling them with DDR2....


Jesse

thanks

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a c 128 U Graphics card
a b } Memory
August 1, 2011 1:19:18 PM

Check out Nvidia's SLI zone for the answer to this question:

http://www.slizone.com/page/slizone_faq.html#c19

You can't mix cards with different memory sizes and expect them to run in SLI. Whether or not the speed has to be the same is a moot point in your case, but I would expect the memory speed would have to match.
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August 1, 2011 1:41:48 PM

im quite certain you can still run SLI with different memory sizes despite nVidia not updating their website. On older series you cant, ive seen these many times. Just dont know about the memory type, anyway im fairly sure thats it..
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a c 128 U Graphics card
a b } Memory
August 1, 2011 1:45:59 PM

000lynx said:
im quite certain you can still run SLI with different memory sizes despite nVidia not updating their website. On older series you cant, ive seen these many times. Just dont know about the memory type, anyway im fairly sure thats it..

Other than 3rd-hand accounts of this working, I've never known to get it working themselves. Have you been successful with this type of setup, 000lynx?
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a c 128 U Graphics card
a b } Memory
August 1, 2011 2:14:40 PM

There's mention of being able to mix memory sizes with the older cards, using Forceware 80 though I think this has since been replaced by or become part of the standard drivers which may not support this any longer:

http://www.slizone.com/object/slizone2_rel80.html
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a c 128 U Graphics card
a b } Memory
August 1, 2011 2:46:04 PM

Digging deeper...

2 links refer to creating a new registry DWORD entry 'Coolbits' and setting it to a value of 18 under HKEY_LOCAL_MACHINE \SOFTWARE \NVIDIA Corporation \Global \NVTweak:

http://www.slizone.com/object/slizone_coolbits.html
http://www.evga.com/forums/tm.aspx?high=&m=559044&mpage...

After you reboot, you should be able to run SLI with the different memory sizes (unless they've completely removed this functionality through the drivers).
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a c 128 U Graphics card
a b } Memory
August 1, 2011 3:10:11 PM

I'm going to conclude it doesn't work any longer, unless someone can prove me wrong. I tried to apply the Coolbits method to my single GPU laptop using value 1A which should allow all the SLI and OC capability as this link describes:

http://www.slizone.com/object/slizone_ask_mmm005.html

I can't OC my laptop card with this setting nor do I have any setting to OC and I'm at driver level 197.16 on my this particular PC.

I'm thinking the whole Coolbits method applied to drivers from way back when. The link I referred to talks about forceware 78.01. Current driver release is 275.33.
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August 1, 2011 4:08:50 PM

hmm theres seems to be ALOT of uncertainty in relation to SLI Configurations. I would probably steer clear of it had i not already bought a second card from ebay. Anyway, ill work on the likely assumption that it has to be the same and purchase an identical memory size and type card ....bummer

thanks for the help ubercake :) 
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August 11, 2011 7:32:46 PM

Best answer selected by 000lynx.
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a c 271 U Graphics card
February 3, 2012 8:08:49 PM

This topic has been closed by Mousemonkey
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