GTX460 1GB with 768 MB in SLI???

[Blackwhite]

Anybody tried this configuration, is it possible it will work.They are same Fermi 104 chips, but one has 8 ROPs less nad 192 vs 256 Bit memory.

?

 

[alienware]

I would say no. The specs don't match totally.

It's a very good question though and I can't be sure. Would be interested to find this out !

 

[TMaksimov]

I don't know. We could wait for Tom, he should have at least one of each from the big mid-range test http://www.overclock3d.net/reviews/gpu_displays/his_vs_evga_midrange_gaming_face_off_review/5

 

[thestepster]

good question dont even know myself intresting to fin out tho, but if it works what will happen is the 1gb card will get scaled down to the 768's cards specs

 

[AMDFTW]

doesent SLi cards have to have the exact spec

same memory,bus width etc etc

i dont think they will work

 

[thestepster]

well thats where im a bit confused cause u could sli an 8800gt and a 9800gt and they had different memory bus

 

[AMDFTW]

with no flashing or mods?

i no you can sli the 250 and the 9800gtx+ but with a bios flash

 

[thestepster]

not sure, i had them in my pc b4 the 460's and it came up sayin i could sli them and usually thats a good indication but i never bothered with it wish i did now to see if it worked

 

[alienware]

doesent SLi cards have to have the exact spec

same memory,bus width etc etc

i dont think they will work

Well that's what I was thinking. I know the clock speed is irrelevant because I set up a pair of 8600GTS in SLI and one was a BFG OC edition. However they were identical, apparently you put the faster card in slot 1 and use the slower one as a slave.

But, the differences in the 1gb and 768 are far broader than that. They might have a different VenID ! Infact, let's get this solved.

If some one with a 768 can take a screeny of their VEN_ID (instructions below) and some one do the same with the 1gb we can get this answered fast. SLI will *ONLY* run on the same vendor ID.

OK. Win7. Go to the start button, right click my computer, properties.

Control panel home - device manager.

Display adapters - your card (Mine is a GTX 470 for reference). Right click, properties.

Go to details. Under the property drop down go to Hardware IDs.

Two ways to do this.

Press ALT and Print Screen (PRT SCRN on some keyboards) but make sure you have the window at the top. Go into paint, CTRL V (paste). Save as - JPG.

You should get something like this. I have added the red line to indicate what you need here.

10DE = Nvidia. This is how an SLI board disables Crossfire

if it doesn't see 10DE then the bios disables linking the lanes. Some boards are so aggressive with this that when the drivers load on the way into Windows the bios can force a reset (see my Crosshair 2 780a board).

After that read - 06CD. This is the GTX 470's ID. Again, before the board will allow SLI it will look at those codes there for a match. If it doesn't see one? no SLI. What we need here are those IDs from a 768 and a 1gb. If you can't get a pic sorted type out the second line of the PCI\VEN.

 

[thestepster]

it worked with all my 8000gt's i had inno 3d's, generic, 2 x gigabyte, bfg and sparkle and the 9800gt was a BGF OC Edition

here's the prints of the 460's in Inno 3d and Asus reference 768 flavours

 

[alienware]

OK device code is 0E22 and you obviously have a match

All we need now is a device code from the 1gb.*

*Obviously if they do match I'm still not 100% sure they will work but if they don't I can be sure they don't work

 

[thestepster]

if they match that code and work i think the 1gb will get its mem dropped to 192 bit and ram to 768 just like what happens with ram on your mobo if u use 1 faster and one slower they both run at the slower speeds

 

[Rastalovich]

I *think* with the SUBSYS being xxxx10DE, the card was actually 'made' by nVidia. When the SUBSYS doesn't include 10DE, it's 3rd party. Something like that.

ID being 10DE is obviously nVidia.

Having the correct *identical* hardware specs *shouldn't* matter, aslong as the SLI software is fooled into thinking they're the same and they both can use the same NV instructions.

The final detail concerning the hardware *should* be handled by the cards themselves.

Of course, there are SLI/xFire hackers who can tell you for sure.

 

[thestepster]

the cards i have are both reference cards only difference is both the inno3d looks to have the stock NV bios and the asus has an asus bios on it

 

[tinytomlogan]

I love how people think Ive got time to build a rig just to see if it works! Sadly the EVGA cards as with lots of other hardware has gone back.

We dont get to keep everything you know fellas

 

[SnW]

Guys i can try this if you still want me to do so ?

just need to swap over my 1024Mb one to my second rig...

but it doesn't work IIRC

Really don't think a 192bit bus works with a 256bit one

 

[thestepster]

yeah give it a try please ray would be interesting to know of it does

 

[SnW]

yeah give it a try please ray would be interesting to know of it does

Oki Doki, i will swap the card after i had my food

 

[thestepster]

cheers mate, u will sort this out once and for all, hope it works if it does would it perform good?

 

[SnW]

Sorry just found some time to put the SLI bridge on the GPU's,

result , does NOT work.....