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Topic: 500W PSU power issues with 5770 (Read 1511 times)

sr. member
Activity: 281
Merit: 250
January 03, 2014, 12:49:03 PM
#8
How long it would have worked i don`t know, but it was this one.

http://www.scan.co.uk/products/500w-cooler-master-gx-lite-rs-500-asab-86-eff-quiet-fan-atx-v23-psu

Asus 7870 and Gigabyte 7950.
full member
Activity: 140
Merit: 100
January 03, 2014, 12:35:00 PM
#7
Not sure what you mean with two molex connectors, but i guess it`s a 6pin->2xMolex? In that case, you need to connect them both.
ATM i`m running a 7870 and 7950 on the cheapest coolermaster 500w PSU, so i can`t imagine a lack of power is the issue.  Smiley

I had a cheap 650w psu and it couldn't handle a single 7950, and you're saying a cheap 500w can handle a 7870 + 7950 setup?
newbie
Activity: 28
Merit: 0
January 03, 2014, 10:50:57 AM
#6
I'm sorry to inform you, but the PSU you bought is not capable of delivering 500W ... it's just another cheap and crappy PSU (like Heden, Advance, LCpower and such) which can be dangerous ...

Here is a word about your PSU : http://www.expertreviews.co.uk/psus/118103/sumvision-power-x-500w
Today, no serious manufacturer will sell (real) 500W PSUs without a PCIe connector ... 600/650W will come with two connectors, 700/800W with four, 1000W with six ...

You can find a few reviews with load test of such PSUs, and that's quite terrible ...

Never neglect PSUs, they are the most important piece of your computer. Never try to save money on it, and always go for well known brands (Corsair, Antec, Seasonic, Fortron, ...). The extra bucks spent on them might save you many more if your components (or even house) gets damaged by a crappy cheaper PSU !
full member
Activity: 133
Merit: 100
January 03, 2014, 08:04:46 AM
#5
Yeah, I meant this. That should work since it's drawing power from both rails, I'm just ashamed it didn't work from one, lets see what the results are once it arrives Smiley



Should work fine with both. When just connecting one molex, you just power 3 of the 6pins. Wink

Ah! That makes sense! Derp  Cheesy
sr. member
Activity: 281
Merit: 250
January 02, 2014, 07:06:14 PM
#4
Yeah, I meant this. That should work since it's drawing power from both rails, I'm just ashamed it didn't work from one, lets see what the results are once it arrives Smiley



Should work fine with both. When just connecting one molex, you just power 3 of the 6pins. Wink
full member
Activity: 133
Merit: 100
January 02, 2014, 05:55:50 PM
#3
Yeah, I meant this. That should work since it's drawing power from both rails, I'm just ashamed it didn't work from one, lets see what the results are once it arrives Smiley

sr. member
Activity: 281
Merit: 250
January 02, 2014, 05:43:49 PM
#2
Not sure what you mean with two molex connectors, but i guess it`s a 6pin->2xMolex? In that case, you need to connect them both.
ATM i`m running a 7870 and 7950 on the cheapest coolermaster 500w PSU, so i can`t imagine a lack of power is the issue.  Smiley
full member
Activity: 133
Merit: 100
January 02, 2014, 12:01:27 PM
#1
Hi,

I've had a spare HP Pavilion for quite a while, it was used as a homeserver. Until now, I wanted to use it for some scrypt mining. I bought a 5770 off my friend and installed it along with a new 500W PSU from eBay (here). After wiring everything up, the computers fans spin up and down spin down and if you listen carefully it's as if the graphics card isn't getting enough power. How can this be? I'm using a 500W PSU... Unless it needs to take two molex connections to the 6 pin connector instead of one which is what I tried. I'm awaiting my cable to see if two molex's will do the job. If not, what to do?

Thanks.
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