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GPU Upgrade on a cheapo OEM PSU.

post #1 of 5
Thread Starter 
My friend is tired of having to play on low detail and has enlisted my help in selecting a new GPU.

HP P6644

CPU: Pentium E5500 2.8GHz

RAM: 2x2GB DDR3 1333

HDD: 1TB 7200RPM

Current GPU: Radeon X1300

PSU: Bestec branded 250W.

Now the problem is; he wants the best GPU possible that can be powered by the current PSU and draw power from the PCI-E slot. So I'm thinking of the Radeon HD7750

Looking at the specs for the PSU
img_1405.jpg

14 Amps on the 12V rail... Even with my limited knowledge of PSU's, I can tell that's low. Plus with capacitor aging (PC was made in 2010) it wouldn't be supplying as much power as stated on the sticker.

But again I know jack-all about PSU's, which is why I'm asking all of You tongue.gif

i would think that the PSU probably could power the 7750, but the PSU would be near maximum output and iirc; it's not a good idea to run a cheapo PSU near 90% load.


So what's Your opinion? Suggest the 7750 without upgrading the PSU or recommend an upgrade (I'm thinking that the CX430 would be a relatively cheap, quality upgrade which will help future proof his PC and guarantee enough power for the 7750?
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post #2 of 5
I would upgrade the PSU.
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post #3 of 5
Get FSP 400W for 25$. It's cheap and reliable power supply.
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RAMRAMRAMHard Drive
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Black Water Ultimate 123 [3x Corsair AF120 Perf... MCP655 with Alphacool HF acetal top [5th gear] Feser 10/13 UV Tubing Alphacool CKC clear 
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Cooltek 120mm rad [antec tri-speed] Cooltek 120mm Rad [Corsair SP120 High Performan... Alphacool GPX-A 290 [290X waterblock] Windows 7 Ulitimate 64 bit  
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4Tech X7 G800 Cooler Master Real Power 850w Cooler Master Haf 932 Amd Edition Microsoft Mobile Mouse 4000 
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20GB FB-DIMM@800mhz 2x40GB WD RAID0 Sata [11year old as for 2015] 2x73GB HP 15K RPM RAID0 SAS HP 10K RPM 143GB SAS 
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post #4 of 5
get a 350w psu with atleast 22a on +12v rail.
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post #5 of 5
OP, your instincts were right on picking the CX430. It could easily power an 7870 all day every day, let alone a 7750.

Assuming you're in the United States, this is the best price I can find: Corsair CX430 @ Newegg

Currently $45 - $5 instant savings (enter promo code EMCXTXW26 at checkout) - $20 rebate card = $20 after rebate w/ free shipping.

Personally, the $20 outlay for the CX430 is worth the peace of mind of using it instead of a POS 250w OEM PSU. Note that the promotion expires March 7th.
Edited by svenge - 3/1/13 at 10:24pm
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