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8800GTX and 450W psu

  • Power Supplies
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Last response: in Components
May 7, 2008 9:04:46 AM

Well, my current Setup:

Amd Athelon 3500+ (939)
K8N Neo4 platinum (Nforce 4 ultra Chipset)
MSI7900GT-256MB (oc'ed at 525/801)
1xSata2 WD320GB
1xSata2 Samsung 80GB
1xAsus CDRW

(Plus All USB Ports Full :p )

The Current PSU is 450W(peak) AOpen psu.

Problem: Im upgrading to 8800GTX, and have an option to purchase CorsairHX620 (620W)psu.

According to, Power Consumption is not that great for GPU's and the 620W seems to be an overkill.

SO: Will my current 450W psu work with the 8800GTX or shud i go for the Corsair?

More about : 8800gtx 450w psu

a b ) Power supply
May 7, 2008 9:49:32 AM

Probably not.
What is the +12V amperage on your PSU?
Even if it is high enough, it would be a good idea to upgrade to the 620W PSU.
The GTX is quite a power hog.
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May 7, 2008 9:57:40 AM

it's not just the 450 part, it has to have enough amps on the 12volt side and not just the 3.3 and 5 volt side. A lot of older power supplies had a lot of power on the 3 and 5 volt side and less on the 12 volt. Problem is now that new stuff use more power on the 12 volt side and les on the 3/5 volt side. Newer cards like the geforces pull it all off the 12 volt side. You might have 450 ( peak) but it might only be 350 or so continuous, plus it might be on the 3/5 volt rail which does you no good.

You need to post your model number and such. A good place to go would be, their main focus is power supplies and people over there know a lot about them and what is inside. You need to give us the model number and a picture of the sticker though to be able to tell for sure
May 7, 2008 10:02:57 AM might work, but it could also die, depends on the quality of the build and if your gonna overclock, but I think it is pushing it on a GTX. I am no expert though, so I would go to that site and ask the people that actually test power supplies. A lot of inexpensive supplies fail WAAAY before their rating around 50% load on some, so it is best to see if anyone over there would know.
May 7, 2008 10:04:27 AM

Agreed. It seems that this is the case with my psu as well.

Model Z450-08APA

+12V (1): 18A
+12V (2): 18A

+3.3V: 30A
+5V: 28A

The corsair620 has 24A on 3.3,and 30A on 5? Is that ok?
May 7, 2008 10:06:31 AM

btw, im also a bit shaky on the dying part... i think it wud be pushing it to the limits with a gtx (esp when oc;'ing).
May 7, 2008 10:16:27 AM

Ive used a 420 watt with 18 amps per rail, a bit better quality than yours, with a G80 GTS, but I felt I was coming close to maxxing it out. I wouldnt do it, not sure about aopen, and its no better than my old enermax