Tom's Hardware > Forum > CPU & Components > Power Supplies, PC Cases & Case Mods > Will this PSU work?
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mad-dog   10-13-2007 at 06:20:41 AM
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Yup, the X1900GT consumes 75W of power and should work fine with the 420W PSU, just be careful not to overload the PSU when designing the system around it.
The CPU will draw another 75-125W, then you gotta add some more for RAM, motherboard, Hard drive, CD/ROM, DVD/RW, Fans, lighting.....
before too long the 420W PSU will be unable to run the system.
to be honest with you a 420W PSU is really too small to run a decent system, a PSU should not have to operate at 100% anyway, it needs sufficient headroom.

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croc   10-13-2007 at 07:45:20 AM
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No, you need at least a 600 watt rosewill unit for your system.

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Gravemind123   10-13-2007 at 07:46:39 AM
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It should be fine, most current mainstream CPUs are about the 65W TDP mark. That gives you about 140W for CPU and video card. Even after adding all of the other things in your system, you still are under the 420W mark. It probably won't be able to take another graphics update after this, but should work fine for now.

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tlmck   10-13-2007 at 08:36:02 AM
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No. Your wattage is in the iffy range, and the spec for this card calls for a PSU with at least 30 amps on the 12 volt rail(total system). Your PSU only supplies 18 amps. Most likely it will boot up, but will fail shortly thereafter.

This one will not fail. http://www.newegg.com/product/prod [...] 6817139003

Your current PSU is perfectly fine for a mid range system. It just was not made for a high end video card.

Message quoted 1 times
Reply to tlmck
kpo6969   10-13-2007 at 11:21:51 AM
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tlmck wrote :

No. Your wattage is in the iffy range, and the spec for this card calls for a PSU with at least 30 amps on the 12 volt rail(total system). Your PSU only supplies 18 amps. Most likely it will boot up, but will fail shortly thereafter.

This one will not fail. http://www.newegg.com/product/prod [...] 6817139003

Your current PSU is perfectly fine for a mid range system. It just was not made for a high end video card.


No way
Thermaltake TR2 430w W0070 18amps
http://forums.guru3d.com/showthread.php?t=205763
The Corsair above has 33amps


Message edited by kpo6969 on 10-13-2007 at 11:22:29 AM
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