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8600gt upgrade to 8800gts

Last response: in Graphics & Displays
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Ok, little over a month ago i bought a xfx 8600gt. Have liked it ok, overclocks pretty good, but runs a little hot and I would just like to get some more frames. I was thinking about changing it out for a 8800gts 320 mb. Question is how much of an increase in framerates can i expect ( i get around 35 on bf2142 and 30 on lost planet demo ( vista..... slightly higher frames on xp) ). Also, will my cpu and ram bottleneck a 8800gts.

And please no one say "why didn't you just get a gtx?!?" its completely irrelevant to my question and i dont have that kind of money to throw around.

My system:

Amd 4000+ (socket 939 oc'd to 2.6)
2 gb ddr400 ram
some gigabyte mobo (sux but does the job)
450w ps
8600gt

More about : 8600gt upgrade 8800gts

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i m 2nd to that, get the 8800gts 320mb. most people here will tell you to get the 640mb's but since you value your $ so i think the 320mb one is best suit for you. no i dont think your cpu will bottleneck the 8800gts

After thinking about this, is my ps gonna be able to support it? I did some watt calculator thing online w/ my system setup and even w/ all my fans and the overclocked cpu it still gave me a reading of 350 watts ( including the 88gts not my 86gt ). So I think i'm ok on the watts. The amps scare me though. How many amps should i have on each rail to run the gts and is that written anywhere on my ps or do i have to find it online (not at home to just look at it) thanks
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Ok, so my ps is made by L & C and its model number lcb450e. I've looked and i've found that it is 18a and 15a on the 2 12v rails but i can't find anything else about it. I think i'll probably be ok, but can someone verify??
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