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Can I run ATI HD 4870 with old 500 W PSU?

Last response: in Graphics & Displays
May 5, 2011 6:35:41 AM

I am trying not to bleed any more money on my old rig which is what I use for casual gaming. My old card crapped out on me and I picked up another card off of craigslist which is the ASUS EAH4870/2DI/1GD5 without realizing that my old power supply is a bit antiquated.

So I would like to know if it's possible to still power this card without issue with my current power supply.

My power supply is an Ultra 500W with the specs below. The PSU does not come with any PCI-e (6-pin) but I was thinking of getting a couple of the 2 molex -> PCI-e adapters to power the card.

Here is my thought, the HD 4870 requires 2 PCId (6pin). My PSU has 6 molex so I can take 4 of those and use the (molex to PCIe) adapters to get 2 PCIe. The other 2 molex would be to power the rest of my HDs and a CD rom.

AC Input: 115V/230V 10A/6A 60/50Hz
DC Output: 500W (Max Combined Watts)
+3.3V: 28A
+5V: 30A
+12V: 34A
-12V: 0.8A
-5V: 0.3A
+5V: 2A
Dimensions: 5.9' x 3.4' x 6.2'; 150mm x 86mm x 158mm
1 x 20-Pin Power
1 x 6-Pin AUX (Xeon) Power
1 x 4-Pin 12V (P4)
6 x 4-Pin MOLEX
1 x SATA Power Y Adapter
1 x Floppy

My rig spec:
AMD Athlon 64 x2 5600+
Board GeForce6100PM
2 GB RAM PC2-6400
I am currently running 4 SATA HD but I can cut down to 2
1 BD/DVD Drive

More about : run ati 4870 500 psu

a b U Graphics card
a c 144 ) Power supply
May 5, 2011 6:58:40 AM

Maybe. I am unfamiliar with the brand.

One of my systems has an OC'd Q9550, 4 GB RAM, a GTX260 - a card with similar power requirements to yours, a Gigabyte EP45-UD3P motherboard, 3 hard drives and an optical, and a Soundblaster card all powered by a Corsair 750TX.

Running 3 instances of Prime95 to load the CPU and 3DMark06 to load the GPU, it pulls 375 watts from the wall as measured by my Kill-a-Watt meter. Figuring 80% efficiency, the system pulls 300 watts from the PSU.

Try it and see. I am a little doubtful because is is an old design - the 20 pin main power plug is a give away.

Best solution

May 5, 2011 7:06:12 AM

you should be fine, a 4850 runs fine on my 400W, so unless it's under 80% efficiency, it should be able to pull it just fine. But note that , that card would be seriously limited by your cpu. HAPPY GAMING :) 
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May 5, 2011 7:17:03 AM

Thanks for the quick replies. I will give it a try and hopefully I won't fry anything or would I?

Would it harm any of my components if it's underpowered and it keeps rebooting at the first sight of gaming?
a c 107 U Graphics card
a b ) Power supply
May 5, 2011 3:24:54 PM

It's the brand that CompUSA pushes. Yeah it should be o.k with a 4870 with stock clocks. It shouldn't fry anything so just go ahead and use it for now.
a c 107 U Graphics card
a b ) Power supply
May 5, 2011 3:26:35 PM

Just don't run furmark and prime 95 at the same time.
May 12, 2011 12:17:23 AM

Best answer selected by dexterbot.