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Wattage for xfire 5770's and possible upgrades

post #1 of 15
Thread Starter 
I'm plan a micro atx build and am going to crossfire 2 5770's and I plan to get a i5-655k with 8 gbs of ram. I have already decided to go with a Seasonic X-series PSU cause of the cramped case and overall high suggestion rate. But my main issue is deciding what wattage to get. I do plan on keeping the rig for a while(3-4 years) and only upgrading the video cards when the xfire 5770's just won't cut it. Also plan to overclock. I've been looking at the x750watt thinking that it should be plenty for future upgrading. But I was wondering if that might be overkill to the extreme or might be just enough until I upgrade.
post #2 of 15
That setup would run fine on the X560. If you want room for upgrades, I wouldn't go past an X650. You can power a lot of stuff on 650W.
post #3 of 15
You'll be fine with a 650 with two 5770s, you'll have a low over head though. If I where you I'd buy a 750+.
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post #4 of 15
Quote:
Originally Posted by zhevra View Post
You'll be fine with a 650 with two 5770s, you'll have a low over head though. If I where you I'd buy a 750+.
I think you're overestimating the power draw of the 5770... Two 5770s at stock speeds will draw a maximum of about 200W DC from the PSU while running Furmark, and obviously a lot less (~150W) under a normal gaming load. 650W isn't a low overhead in this instance, at all.
post #5 of 15
Thread Starter 
I would agree with you but what about both cards and cpu overclocked?
post #6 of 15
Sell the 5770 buy a 6950 flash it to 6970 and be happy longer
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post #7 of 15
Thread Starter 
Quote:
Originally Posted by Serious_Don View Post
Sell the 5770 buy a 6950 flash it to 6970 and be happy longer
Yeah expect that I have 2 of them and I don't feel like selling them. And I'd rather get 2 5870's then "hope it'll work long enough" unlocked card.
Edited by animal0307 - 1/12/11 at 2:55pm
post #8 of 15
Quote:
Originally Posted by animal0307 View Post
I would agree with you but what about both cards and cpu overclocked?
The CPU makes little difference, it's not like it's put under heavy load very often at all. As for overclocked 5770s... their power consumption doesn't quadruple when overclocked like the GTX 460 (just exaggerating to make a point)
post #9 of 15
Quote:
And I'd rather get 2 5870's then "hope it'll work long enough" unlocked card.
The 6950 and 6970 are the same physical card, the 6950 is essentially a locked 6970. I don't see any reason why it wouldn't work just as long as any other video card. For the price to performance ratio, a 6950 unlocked to a 6970 blows away everything else on the market. Even if it doesn't unlock for some reason (although I've seen 100% unlock rates), the 6950 will still smoke crossfire 5770's.
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post #10 of 15
Quote:
Originally Posted by Shub View Post
I think you're overestimating the power draw of the 5770... Two 5770s at stock speeds will draw a maximum of about 200W DC from the PSU while running Furmark, and obviously a lot less (~150W) under a normal gaming load. 650W isn't a low overhead in this instance, at all.
Agreed. Isn't it best to over estimate a wee bit? efficiency is a factor to. Hes also planning on upgrading over the next year or two. He might as well buy a better PSU now so he won't have an issues down the road, could potentially save him some $$$$$.
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Black n White
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CPUMotherboardGraphicsRAM
Q6600 GO @ 3.9Ghz Asus PQ5 Deluxe XFX 5770 in CF Mushkin Enhanced Blackline 4GB DRR2 OCed, 1106 
Hard DriveOptical DriveOSMonitor
2x WD Blacks 500GB(Raid 0) - 1 WD Black TB 1 Light Scribe Optical Drive Windows 7 Ultimate 64 Bit Acer 22'' Samsung 17'' 
KeyboardPowerCaseMouse
G15 Logitech 650 Watt, Antec RocketFish - Modded. G5 Logitech 
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Gray Thing 
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