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Best GPU for a 400W PSU System (Med-High Gaming)

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November 27, 2013 9:52:23 AM

CPU: AMD Athlon II X4 635 2.9 GHz
Motherboard: MSI 785GM-P45 AM3 Socket
GPU: Radeon HD 4200 (Integrated Graphics)
HDD: Samsung HD502HJ 500 GB 7200 rpm SATA 3.0Gb/s
RAM: 2 x OCZ 2GB DDR3-1333 (4 GB Total)
PSU: Off-Brand (Apex Brand) 400W and 20 Amps, is probably not 80 PLUS certified. Only has one free PCI-E connector open.
Image of PSU
The single PCI-E connector
The motherboard/guts

When I did it out it says, without a graphics card, the output of the system is 269W, which seems low.

I have this old computer and I am looking to upgrade it by adding a graphics card (The CPU is good enough for most games, and I don't have enough money right now to completely scrap it and build from scratch). What is the best graphics card I can get that can fit? I was looking at either the ATI Radeon 7750 1GB or the Nvidia GTX 650 Ti 1GB. Will either be bottlenecked by the CPU?

I don't want to max out any games, I just would like to be able to play them smoothly and on medium-high settings. I am interested in games like Borderlands 2, Batman Arkham Origins, Skyrim, etc.

My current laptop (which I use for gaming) is:
CPU: APU A8-3500M 1.5 GHz
GPU: Radeon HD 6750M (Dual Graphics Set-Up)
HDD: 640GB, probably 7200 rpm SATA 3Gb/s or maybe SATA 6 Gb/s
RAM: 6 GB total, DDR3-1600

So I'm looking for something better than that. Thanks for all the help!
Thanks for the help!
November 27, 2013 9:59:01 AM

Geforce GTX 650ti - 20A and a 400W PSU minimum



This is from MSI, If it is a complete off brand I wouldn't do it if it is antec it should be okay, they aren't top tier but are a decent brand. That cpu will hold back the gpu a bit but it should still run better than your laptop, if you don't like the perfomance upgrading to 8gb or ram will help you as well, and the gpu+ram could both go to a new future rig if you chose.
November 27, 2013 10:01:13 AM

Amd cards more cpu dependent than nvidia cards..
that's mean..slow processor will hold the graphic card to extract performance, even the game is not..

Get the 650Ti nvidia card.
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November 27, 2013 10:23:25 AM
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I don't think your system can handle a 650ti, a normal 650 would be recommended.
20A on the 12V rail is low, and 225W for 3.3 + 5 and 380 for 3.3 + 5 + 12 means only 155W for ALL components of the 12V rail.
That, for a max CPU power of 95W, will leave only 60 W for all other components.
No way a 650Ti will be able to run on that system.
I'd say a 7750, but even that is risking it.

Why don't you get a cx430 from corsair, it's got more current and it is not very expensive either.
November 27, 2013 10:28:10 AM

Jeez, I should just get a new PSU then... I knew it was crappy when I looked at it.
November 27, 2013 10:29:21 AM

may not be a crappy psu per se, just not for gaming.
November 27, 2013 10:43:03 AM

Thanks for the help, cheers mate
November 27, 2013 10:45:29 AM

You're welcome.
!