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Old August 22, 2009, 09:29 AM
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I'm thinking of throwing in another HD4890 (see sig) to run Crossfire. Just wondering if current (no pun intended) 620W PSU -again, see sig- can handle the two cards plus a couple of 7200RPM SATA drives and the usual peripherals. PSU Calc shows roughly a max of 425W taking overclock into account. I'm not sure if the 'crossfire' designation implies a single x-fire card or two physical cards.


Thoughts?


[edit] Oops! Just discovered the HX620 I have only has 2 6-pin PCI-e plugs. Need 4 for x-fire. So based on that I may need to bump up to HX750 or HX850.
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Last edited by Signal2Noise; August 22, 2009 at 10:48 PM.
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Old August 22, 2009, 04:57 PM
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You'd be on the edge with a 620W. I'd suggest you to go with the 850 on the safe side considering you will overclock your GPU.
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Old August 22, 2009, 07:19 PM
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Cheers, Dr. P! Already making the plans for an 850.
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Old August 22, 2009, 08:20 PM
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620W will be perfectly fine.
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Old August 22, 2009, 10:52 PM
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Quote:
Originally Posted by lowfat View Post
620W will be perfectly fine.

Wattage *may* be okay but considering the two cards require 4 PCIe 6-pin connectors then no it will not be perfectly fine.
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Old August 22, 2009, 11:12 PM
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Well you could use molex to PCIe adapters. Not ideal though, but doable.

Though the HX750/850 are simply awesome modular PSUs and if you can afford one, then go for it.
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Old August 23, 2009, 03:11 AM
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You need 2 PCI-E adapters otherwise HX620 is plenty for your future setup.
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Old August 23, 2009, 09:17 AM
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Quote:
Originally Posted by burebista View Post
You need 2 PCI-E adapters....
Erm...no. A single HD4890 card requires 2 PCIe 6-pin plugs. Simple math dictates I will need a PSU w/ four 6-pin plugs.
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Old August 23, 2009, 09:21 AM
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Quote:
Originally Posted by Signal2Noise View Post
Erm...no. A single HD4890 card requires 2 PCIe 6-pin plugs. Simple math dictates I will need a PSU w/ four 6-pin plugs.

then 4 pci-e adapters :P
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Old August 23, 2009, 09:22 AM
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Quote:
Originally Posted by Signal2Noise View Post
Erm...no. A single HD4890 card requires 2 PCIe 6-pin plugs. Simple math dictates I will need a PSU w/ four 6-pin plugs.
I'm pretty sure he means molex adapters, not the actual plug on the PSU itself. That 620W is plenty.
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