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Can you crossfire a 2gb 5870 with a 1gb 5870?

Last response: in Graphics & Displays
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May 26, 2010 10:04:55 PM

I am running eyefinity 3x1. Does anyone know if a 2gb 5870 will play nicely with a 1gb 5870.

Linus Tech Tips 4 minutes in the video says "he doesn't think you can" does anyone know?
http://www.youtube.com/watch?v=eB09i8QnnNY
a b U Graphics card
May 26, 2010 10:12:21 PM

Not positive on the 5870 but with other cards you can mix ones with different amounts og VRAM but the cards will only use the amount of VRAM that the lower card has (thus you would be wasting the 1GB of VRAM on the second card when in Xfire.
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May 27, 2010 12:20:28 AM

I guess we will find out. I have a 2gb 5870 on order and didn't even bother to think about the compatibility issue until I saw that youtube video. Worst case senerio I sell the 1gb 5870 and get a second 2gb.
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May 27, 2010 3:29:45 AM

Another question, i have a 850w thermaltake psu will that power two 2gb 5870s ATI says 900w required but under load they are supposed to run 228 watts each?
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May 27, 2010 3:39:36 AM

Only says that 228w but include the watts required by your MOBO, CPU, HDD, etc. To be really safe get a 900w 80+ certified PSU.
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May 27, 2010 3:40:27 AM

850 watts should be fine because it will power one 2GB and one 1GB,. But if you go into 2 2GB, then u should upgrade with what the ATI requirements are
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May 27, 2010 3:45:35 AM

@^ Didn't you read what they said? It would scale down meaning the watts required would be less. @brennon7 The thing also with not having a higher psu is that there is no means of overclocking available cause there may be a chance for your power supply to break down and cause your computer to break down also.
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June 2, 2010 12:10:23 AM

2GB 5870 with 1GB 5870 = FAIL It ran worse than a single 5870 and showed these errors








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June 2, 2010 1:18:48 AM

Didn't know there were 10.5 drivers.
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June 2, 2010 1:46:45 AM

Quote:
Youtube videos? really?
Get 10.5, apparently it fixed the bug with crossfire and eyefinity.


That youtube video is MY video of the single 2gb 5870 and the performance I'm getting out of it.

There is not issue with crossfire and eyefinity I have been running crossfire cards and eyefinity for MONTHS started with 5850s and then 5870s. This thread is about mixing a 2gb 5870 with a 1gb 5870. There is no issue when the cards are the same. When they are different that is when it FAILS.
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