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A 600W PSU for crossfire 5830 & 5850? - Page 2

post #11 of 14
Quote:
Originally Posted by t-ramp;14550583 
I wouldn't say it's a bad idea, exactly... Heck, Maximun PC used 2 PSUs in their 2010 Dream Machine. I'm just saying I'd personally manage to mess something up, so it doesn't sound like a very smart thing for me to do. If you don't have any worries, go for it. Those dual-PSU adapters should work fine.

Also, I realize 600W ought to be plenty of power for a 5850/30 pair. Just saying I'd rather have a good 650-750W unit with four PCIe cables. And something a bit more modern - not that the Epsilon platform is bad. smile.gif
It really isn't a very good idea to run two cheap power supplies at the same time. That Dream machine was using two of the same power supplies and they were great power supplies. OP's power supply isn't very good and getting a second one to power one graphics card that might draw 100W at full load is going to cause horrible efficiency at such a low load.
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post #12 of 14
How old is your PSU exactly? Those units are a good 5 years old aren't they?
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post #13 of 14
Quote:
Originally Posted by VW_TDI_02 View Post
It really isn't a very good idea to run two cheap power supplies at the same time. That Dream machine was using two of the same power supplies and they were great power supplies. OP's power supply isn't very good and getting a second one to power one graphics card that might draw 100W at full load is going to cause horrible efficiency at such a low load.
I feel like I'm getting mixed signals here. Do you think the Epsilon could support his intended Crossfire configuration or not? Now it sounds like you think he should get a good 650W (?) unit? I thought going 750 would be a solid choice, looking to the future, etc., and they really aren't all that expensive.

Also, DM 2010 used a 1200W PSU and a 450W drive bay unit I believe.
post #14 of 14
Quote:
Originally Posted by t-ramp View Post
I feel like I'm getting mixed signals here. Do you think the Epsilon could support his intended Crossfire configuration or not? Now it sounds like you think he should get a good 650W (?) unit? I thought going 750 would be a solid choice, looking to the future, etc., and they really aren't all that expensive.

Also, DM 2010 used a 1200W PSU and a 450W drive bay unit I believe.
So I found a review for that power supply. Turns out it is actually a pretty solid little unit even though it is about 6 years old. For that rig you wouldn't need more then a 650 watt max. That power supply should be able to pull that rig without any issues including room for overclocking. 750 is complete overkill. The reason I would normally recommend a 650 watt for that rig is simply because of the selection. You're going to find more power supplies that are of higher quality at 650 then 600. That 600 watt power supply is actually pretty nice and will run that rig without any issues.

If you actually look at the newer GPUs that are coming out they are becoming smaller and smaller (the dies that is). Because of this they need less energy to achieve better performance. That's the reason why the 480 uses more power then a 580. Same goes for the 570 which is also a good bit less power hungry then it's predecessor the 470.

Overall the majority of cards can be run in crossfire or SLI on a 650 watt. The obvious dual GPU cards can't be run in quad fire but cards up to the 6970 can be run in Crossfire with a 650 watt if you do not go past stock voltage. The reason for that clause is that the power used by the 68XX series increases exponentially and more then usual if the power cap is removed allowing for the voltage to be increased even more. So unless you plan on spending big money on something like a 580 you don't need anything more then a 650 watt. The only card that I would consider an exception is the 470 because since it is so cheap (~$190 used) it could be in the price range of the OP but this card would need a 750 watt power supply to run it in SLI.

All of that being said I think I answered all of your questions as best as I could. If there are any other questions I'm subscribed to this thread so just post
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