I am contemplating adding a second ATI HD4850 to my rig for crossfire but wasn't sure if I need to upgrade my PSU first. I've read that it is possible with a 600W power supply but I have some issues with information I found.
1. No-one mentions what brand/model PSU they were using so don't know if my PSU is up to scratch.
2. I have 5 Hard drives where as the examples I found only use 1.
3. I overclocked my CPU to 3.2GHz (Don't know if it makes much difference to power draw)
Here are my Current System Specs:
Intel Q6600 B3 2.4GHz @3.2GHz
ASUS P5Q Pro Turbo
XFX HD4850 512MB (1x 6 Pin PCI-E)
5x Hard Drives
1x Optical Drive
OCZ StealthXStream 600W PSU
Antec 900 case
The general rule of thumb is a high quality 500 to 550 watt power supply with sufficient current (amps) on the 12 volt rail(s) can easily power a system with any single video card made. A high quality 700 to 750 watt power supply with sufficient current (amps) on the 12 volt rail(s) can power a system with two video cards operating in dual mode. There are a few exceptions like the new ATI Radeon HD 5XXX series cards which use less power due to their energy efficiency.
The recommendations are for an entire system.
Corsair, PC Power & Cooling, and Seasonic are some of the brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Lately we've been seeing a few other brands offering some high quality units.
The results are pretty consistent with a Tom's Hardware article published last January about power consumption during gaming sessions. Gamers typically don't go over 300 watts total power consumption. There are some exceptions though.
The current (amps) that a video card requires is a bit more problematic. Most technical reviews only test total system power consumption at the wall outlet (mains). I have the information referenced but I'm not at home right now. I can check later and post the link.
Dang Blasted! I could have sworn I bookmarked a web page page showing power consumption of individual pc components but I can't find it. One of the respected web sites that does technical reviews now has electronic measuring devices which allows them to do that instead of just total power draw at the wall outlet (mains).
I think my PSU shouldn't blow up if I ask too much of it so I'm going to give it a shot.
If however I do require a new PSU, I was thinking of getting a Corsair TX 750W but is it worth spending the extra £15-ish for the Modular HX 750W?
I figure I should spend around £100 on a decent PSU now so that it will last me 5 years or so and allow me to upgrade to say a pair of HD5850's/HD5870's when they come down in price in the future; most probably this time next year when I do a complete re-build.
Yes, the Corsair power supplies are worth the higher price. They are high quality power supplies that consistently earn high marks in technical reviews. They are stable, reliable, and come with a 5 year warranty.
OCZ, while not being the best power supply make, is decent. I highly doubt your power supply will burst into flames if too much is asked of it. And yes, like JohnnyLucky said, Corsair power supplies are worth the higher price. And to add the the recommended list, Antec makes very nice PSU's as well.
This might be the article you were looking for johnnylucky. An excellent article showing actual use by different components. It's worth a read for anyone who hasn't read it. "PC Power Consumption: How many watts do we really need?"