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View Full Version : Is it possible to use a 7800 and a 6800 in SLI?


Eltigre88
08-20-05, 08:23 PM
I own a 7800GTX and a 6800GT can I set these up on an SLI system?

Bandit666
08-20-05, 08:41 PM
I own a 7800GTX and a 6800GT can I set these up on an SLI system?


No....sry.

ricercar
08-21-05, 01:56 AM
Bandit666
Registered User
Join Date: Aug 2005
Posts: 1
Looks like bandit registered exclusively to answer this post?

AthlonXP1800
08-21-05, 02:25 AM
I own a 7800GTX and a 6800GT can I set these up on an SLI system?

No, not with the current driver, upcoming Forceware 80 driver will support mixed cards with different video BIOSes. I dont know exactly date when it will be release.

Lezmaka
08-21-05, 03:00 AM
No, not with the current driver, upcoming Forceware 80 driver will support mixed cards with different video BIOSes. I dont know exactly date when it will be release.

I don't see how that's going to work, unless you're mistaken. I thought the driver would let you use two 7800's or two 6800's with different BIOSes, but not a 7800 and 6800.

AthlonXP1800
08-21-05, 04:04 AM
I don't see how that's going to work, unless you're mistaken. I thought the driver would let you use two 7800's or two 6800's with different BIOSes, but not a 7800 and 6800.

It no mistaken.

http://www.theinquirer.net/?article=24044

shabby
08-21-05, 10:24 AM
It no mistaken.

http://www.theinquirer.net/?article=24044

Where does it mention that you can use a gf6 with a gf7? It simply mentions you can use boards from different companies, ie. asus gf7 with a leadtek gf7.

AthlonXP1800
08-21-05, 10:42 AM
Where does it mention that you can use a gf6 with a gf7? It simply mentions you can use boards from different companies, ie. asus gf7 with a leadtek gf7.

2 months is a long time, I had forgotten where it mentioned "mix cards", it probably from sites like VR Zone or a short interview with Nvidia gave away some hint about Forceware 80 driver.

|MaguS|
08-21-05, 10:50 AM
Athlon I think your confusing this with ATI's Crossfire, I don't think it will ever be possible to mix two different GPUs in SLi. ATI had to create a new board and even rig a new GPU Chipset to accept such a trick... I dout Nvidia will be able to do it with just a driver...

$n][pErMan
08-21-05, 11:45 AM
I don't see how its possible unless the chips were designed to communicate in such a way. I suppose its possible for a 7800 to comunicate with a 6800 but I dont think the 6800 would be able to communicate with a 7800 unless nvidia created a system where the newer GPU would be like a "master" gpu and would basically control the 6800 to do certain tasks (which im sure is way beyond the scope of SLi).

MUYA
08-21-05, 12:01 PM
They have demonstrated bridgless SLI so who knows?

Eltigre88
08-21-05, 12:10 PM
I sware I have already read here in these post about someone who is already using 2 different cards in SLI.

jAkUp
08-21-05, 01:14 PM
Nope cannot be done currently on nV hardware.

Even if it worked, I still wouldn't do it. If it was like Crossfire, it would scale down to 2x6800 Ultras, which is SLOWER than a single 7800GTX in some situations! You will move down to 16s6v. And you would lose TSAA.

OWA
08-21-05, 01:16 PM
I'm not sure you'd want to do this unless they can figure out a way to allow both to run at their full speeds. In crossfire (if I'm not mistaken), they are supposed to allow you to mix a higher-end card with a lower-end card but it makes the higher-end card match the lower-end (in terms of speed, features, etc., that is, goes with the lowest common denominator). If that will be the case for nvidia as well, I don't think you'd want to do that since a single 7800GTX is probably faster than two 6800GTs in SLI.

Edit: Dang, I type too slow. What he said. :)

anzak
08-21-05, 01:35 PM
I'm not sure you'd want to do this unless they can figure out a way to allow both to run at their full speeds. In crossfire (if I'm not mistaken), they are supposed to allow you to mix a higher-end card with a lower-end card but it makes the higher-end card match the lower-end (in terms of speed, features, etc., that is, goes with the lowest common denominator). If that will be the case for nvidia as well, I don't think you'd want to do that since a single 7800GTX is probably faster than two 6800GTs in SLI.

Edit: Dang, I type too slow. What he said. :)

I believe this is only for card with the same GPU. You won't be able to mix a X800XL with a X800XT for example as they have different graphics cores. However, you can mix a X800Pro and X800XT master card since both use the R420 core. At least this is how I understand it.

Since the G70 is so vastly different than the NV40 I highly doubt we will see the two cards working together in SLI.

crainger
08-22-05, 08:56 AM
From what I recently read (for Crossfire), you need a Crossfire motherboard, one Crossfire compatiable video card and then you an mix and match with other cards including and those newer than the 420 core, such as a X800XT/XL. If matched with a slower card the higher spec card will simply match the lower cards pixel/shader pipeline/units, perhaps clock speed as well not sure on that.

ViN86
08-22-05, 09:53 AM
well, if the driver scaled down the 7800 (in terms of pipes, speed, memory, etc.) to the 6800 value, then it would be possible. however, as was stated before, that might not be worth it really.