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Thinking of having crossfire 4870, would my power supply be ok?

Praeceps

Praeceps

Praeceps

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Joined
5 Sep 2009
Posts
63
Hey there I am thinking of getting crossfire and hold off getting new gfx card until maybe the hd 6000 series.
Anyway I'm thinking of having another 4870 to my system.
I have i7 920 @ 3.8ghz
hd 4870 1gb
gigabyte EX58-UD5
6gb ram
650w corsair tx power supply
Now would my power supply be able to handle another 4870 or would that have to be upgraded too?
 
I have virtually the same system as you and i also thought about x-firing 4870's. I decided not to unless i pick up a bargain 4870 1Gb and the reason for me is heat. My 4870 idles at around 55degrees and can reach 80 while gaming. I have thought putting another card directly underneath my existing saphire 4870 (non-referance cooler) would push these temps up even further in my coolermaster elite 335 case. I think i will keep saving and hope the 5850's start to drop over the next few months as they run cooler, quieter and my corsair 650w tx should power it.

What temp does your current 4870 run at under load?
 
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Well at the moment its at 75C, I think at game loading its at early 80s, I don't have fan on manual.

Edit: I use Antec 300 tower
 
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I just feel that 4870's just run a little bit too hot for x-fire (if yours is at 75 degrees at idle/web browsing i am sure after half an hour of a demanding game it could reach 95 degrees). I wish i would have waited for the 4890 to be released as i've heard those run cooler.

Also, i have found a high street store that buys/sells second hand goods that quote online that they will buy my 4870 for £60 or give me £80 as exchange price if i buy something(i.e. 5850) from them. Which i may do or sell the card on aswell as the 3870 and 7900GTO i have.
 
Yeah I have two of the same sapphires you have and linked and my system in my sig runs fine with the two cards but my i7 overclock had become unstable since I added the 2nd 4870 so I have left it at stock till I upgrade the psu.

My temps are usually idle around 50c on my top card with fans set to 30% with the bottom card about 5c cooler.

When I game I set them both to atleast 40% and they max out at around 75c so I dont know how your getting 75c on idle.

So yes the PSU will allow you to use both cards but might make your CPU overclock unstable in my experience.
 
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That was an 4870X2 not 2 x 4870's which I know uses less power than 2 x 4870. But I was running a watercooling setup as well as the i7 @ 4.0ghz. I think a 650w corsair will run 2 x 4870's and a i7 @ 3.8ghz fine.
 
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Laney88 said:
Yeah I have two of the same sapphires you have and linked and my system in my sig runs fine with the two cards but my i7 overclock had become unstable since I added the 2nd 4870 so I have left it at stock till I upgrade the psu.

My temps are usually idle around 50c on my top card with fans set to 30% with the bottom card about 5c cooler.

When I game I set them both to atleast 40% and they max out at around 75c so I dont know how your getting 75c on idle.

So yes the PSU will allow you to use both cards but might make your CPU overclock unstable in my experience.
Click to expand...

Well if I have my fan set on 25% idle it gets around 55c, when its automatic the fan doesn't run on idle so the temps 75c usually.
 
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