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5770 CF and VX450

post #1 of 24
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I own a VX450 and a motherboard capable of x8/x8 Crossfire, was thinking of upgrading to 5770 CF, a friend of mine said that Crossfire on a VX450 would be risky since it entails use of a Y-splitter.
My question is how safe is the use of a Y-splitter and will the VX450 be able to handle 5770CF?
Thank you,
Shodhanth
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post #2 of 24
Even though 5770's really don't use much power, I think it'd be far too risky on only 450w worth of power. Although your CPU is at stock (according to sig), so you might just be fine with no overclocking done on anything.
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post #3 of 24
That'd be a very tight fit and I make no guarantees... but I think it should work. Just don't go running Prime95 and Furmark.
post #4 of 24
Quote:
Originally Posted by Shodhanth View Post
I own a VX450 and a motherboard capable of x8/x8 Crossfire, was thinking of upgrading to 5770 CF, a friend of mine said that Crossfire on a VX450 would be risky since it entails use of a Y-splitter.
My question is how safe is the use of a Y-splitter and will the VX450 be able to handle 5770CF?
Thank you,
Shodhanth
AMD recommends a 600W to power a system with two 5770s in it (proof). However, this is also considering a 600W with a "Peak" rating. The VX450 has a "continuous" rating of 450W. However, I would rather not take a chance, so I recommend getting at least a quality 550W.

But now we're talking about spending even more money which isn't good. So would you be able to afford a new PSU along with a new 5770? A good 550W shouldn't have to cost more than $75 to $100. But, that's USD.
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post #5 of 24
Realistically while gaming you're looking at ~150W drawn by the two 5770s at stock speeds, and your CPU won't be drawing more than 150W (most likely less than that) either... The VX450's +12V rail can supply 396W, so there you have it. Provided you don't have a billion fans or hard drives, I think you'll be fine. Don't overclock, don't do any aggressive benchmarking using Prime95 and Furmark.
post #6 of 24
I ran my cards in xfire with a 450w for a little while that I had for backup as I was waiting to get the psu I have now. You can run it fine and y-splitters are safe enough. Just go for it
post #7 of 24
Quote:
Originally Posted by yakub0 View Post
I ran my cards in xfire with a 450w for a little while that I had for backup as I was waiting to get the psu I have now. You can run it fine and y-splitters are safe enough. Just go for it
Whoa. I'm not entirely surprised, but still: which PSU was it?
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post #8 of 24
Would be cuttin it way too close for comfort. Eh, the most that would happen is your computer would naturally power off under full gaming load. AMD recommends "600w" for a reason.
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post #9 of 24
Quote:
Originally Posted by Diabolical999 View Post
Would be cuttin it way too close for comfort. Eh, the most that would happen is your computer would naturally power off under full gaming load. AMD recommends "600w" for a reason.
But check out this post:

Quote:
Originally Posted by yakub0 View Post
I ran my cards in xfire with a 450w for a little while that I had for backup as I was waiting to get the psu I have now. You can run it fine and y-splitters are safe enough. Just go for it
He's talking about powering his rig with two 5770s in it on a 450W.
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post #10 of 24
Quote:
Originally Posted by TwoCables View Post
Whoa. I'm not entirely surprised, but still: which PSU was it?
I honestly don't even know, I took it out of a gateway that had the psu replaced. I just saw 450w max power and decent 12v amps and hooked up my rig to it and it worked perfectly fine. From everything I've seen, these cards don't use that much energy. A quality 450w like his should run his system fine with two 5770s.

Edit: Ran games like bfbc2 fine btw, no sparks, smoke, explosions, or fried parts
Edited by yakub0 - 1/14/11 at 10:51pm
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