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Video card and PSU - Comp freezing

Last response: in Graphics & Displays
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March 14, 2013 8:45:10 PM

So i just got a new video card (Powercolor HD 7870 Myst) and it has 2 x 6 pin slots necessary to power it. My PSU only has 1 x 6pin and 1 x 2 pin. I called computer exchange and they told me to get a molex 6 pin adapter so I did (http://www.ocforums.com/attachment.php?attachmentid=626...) but the issue I'm having is that my PSU only has one of the 3 pronged hook ups for the molex, the other molex 3 prong hookup is empty. When plugging it in to the video card along with the other 6 pin, the video card runs, yet when I stress it out with playing a game on ultra, my comp blue/green screens and freezes. What is going on?
a c 257 U Graphics card
March 14, 2013 9:22:32 PM

Sounds to me like your power supply is underpowered for your system. PSU make and model?
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a c 79 U Graphics card
March 14, 2013 9:23:59 PM

You have a low end PSU not capable of powering a high end gpu.

What is the model
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March 14, 2013 9:58:09 PM

Your power supply might not be able to produce the required power needed by the video card, the minimum power required by your video card is 500 watts, so when you play with ultra resolution the video card require lots of processing power which means it also require lots of current (power in watts) to do its job, so to play safe you should have atleast 700 watts power supply, this is also due to other component installed in your pc. When buying power supply check that it has 80 plus rating since you have a high end video card.
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a c 166 U Graphics card
March 14, 2013 11:36:40 PM

As mentioned, the PSU is not sufficient.
Your new graphics card works fine until it needs sufficient power which the Power Supply cannot provide.

You need a new PSU. Example:
http://us.ncix.com/products/?sku=59615&vpn=P1550SXXB9&m...

*There are many, many PSU's that have issues. Some die, others create strange noises etc. Read customer reviews and Google online reviews as well. Ensure the proper connections and power.

The above PSU is reasonably priced, should be compatible and customer reviews seem adequate. I can't vouch for it personally though. I did like Corsair but my last CX430 simply blew up on me (20 hours of use) so I don't feel comfortable recommending them though I know this can "happen" to any PSU.

A good PSU is almost an investment as it may last multiple builds. If in doubt, spend a little MORE money but still do your research.
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a c 257 U Graphics card
March 14, 2013 11:43:35 PM

james7811 said:
Your power supply might not be able to produce the required power needed by the video card, the minimum power required by your video card is 500 watts, so when you play with ultra resolution the video card require lots of processing power which means it also require lots of current (power in watts) to do its job, so to play safe you should have atleast 700 watts power supply, this is also due to other component installed in your pc. When buying power supply check that it has 80 plus rating since you have a high end video card.


^ This is completely incorrect unless you buy junk power supplies. A system with an HD 7870 does need a recommended 500w power supply. A system with 2 x HD 7870s in Crossfire only needs a recommended 600w power supply.

http://www.realhardtechx.com/index_archivos/Page362.htm

Read this:

http://www.legitreviews.com/article/1967/11/

" Power usage shown is for the entire system, not just the graphics cards that are tested. "

"Just like the XFX 7850, the XFX 7870 is very power efficient. This is due in part to the 28nm fabrication process that the AMD 7000 series of GPUs is built on. Pulling just 284 watts at full load is very impressive, which means you could effectively run a single GPU system on a quality 400 watt power supply with no trouble at all! "

Key word there is "quality". As long as you have a quality PSU you certainly don't need anything approaching 700 watts. Nvidia and AMD have to recommend high because most people lack a quality power supply and junk models can't put out their rated voltage.

Stick with Corsair, Seasonic, PC Power and Cooling, XFX, Silverstone, Enermax, OCZ, Antec and the higher efficiency Rosewill models. This will assure you have a quality unit. Avoid Thermaltake and CoolerMaster.
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March 15, 2013 5:23:23 AM

anort3 said:
Sounds to me like your power supply is underpowered for your system. PSU make and model?


The PSU is a 600 Watt ATX
model:ATX-CP600W
AC input voltage: 115/230

Would changing the AC input from 115 to 230 do anything at all?
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a c 257 U Graphics card
March 15, 2013 10:35:27 AM

That still does not tell me who makes your power supply. All I get from google is that it might be an Xtreme Gear model from Cyberpower? If so it's low end junk.

Any quality ~500w model from the brands I listed above will reliably and safely power your system.
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