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Dok
05-08-2010, 02:36 PM
I have an ocz stealthxstream 600w and I have been using for about 4 years now. Recently i switched to a quadcore and I want to buy a radeon 5870 and I am afraid im going to kill my PSU.

Are those valid worries? I've been looking at the xfx 750w as a replacement.
kiri
05-08-2010, 02:50 PM
The PSU won't die. The system should drawn under 300W, a good 400W PSU should be enough, so the old 600W OCZ will do.
EaGle1337
05-08-2010, 02:52 PM
I'm pretty sure it'll be using more then 300 watts. Your 600w is more then enough though, even if you calculate in the power loss.
kiri
05-08-2010, 03:09 PM
Well, that of course depends on the individual system, a High-End Core 2 based QuadCore with no more then 2 HDDs and not much overclocking should be around 250-270W load at the PSU. It's a bit over 300W at the socket, but PSUs are rated for the power you can pull out of them.

An i7 based system needs a bit more power, but not that much.
EaGle1337
05-08-2010, 03:26 PM
Well, that of course depends on the individual system, a High-End Core 2 based QuadCore with no more then 2 HDDs and not much overclocking should be around 250-270W load at the PSU. It's a bit over 300W at the socket, but PSUs are rated for the power you can pull out of them.

An i7 based system needs a bit more power, but not that much.
and the video card uses about 100w. Psus also loose their wattage over time, his psu can no longer do 600w, how wattage it's lost i don't know.
kiri
05-08-2010, 03:45 PM
The Graphic card uses around 190W at full load and was already included in my approximation.

Of course the electric components in the PSU lose some capacity over time, some over capacity should be included by the manufacturer in the design and it shouldn't be that much capacity loss in only four years.
EaGle1337
05-08-2010, 03:53 PM
where exactly are you getting your figures from? With your calculations you can run crossfire 5870d off of a 500w psu.. which can't be done.
Dok
05-08-2010, 04:17 PM
ok well i do wanted to add that im using 2 HDDs and i overclock and have 6 fans in my computer atm.
kiri
05-08-2010, 05:08 PM
where exactly are you getting your figures from? With your calculations you can run crossfire 5870d off of a 500w psu.. which can't be done. I mostly get my values from different german sites like http://www.computerbase.de and http://ht4u.net/. A 5870 Crossfire can be powered with a good 500W PSU (lots of 12V Power and Single-Rail), but i wouldn't recommend it, since the PSU uses then ~88-90% (440-450W) of it's total rated capacity.
EaGle1337
05-08-2010, 05:41 PM
I mostly get my values from different german sites like http://www.computerbase.de and http://ht4u.net/. A 5870 Crossfire can be powered with a good 500W PSU (lots of 12V Power and Single-Rail), but i wouldn't recommend it, since the PSU uses then ~88-90% (440-450W) of it's total rated capacity.
well then my psu must suck even though it's from a reputable brand and a seasonic oem, as mine can't even dare to run a of them.
370forlife
05-08-2010, 05:43 PM
A 500W may be able to run a pair of 5870's doing normal gaming. Just don't go running furmark and the such for hours.
Dok
05-08-2010, 05:55 PM
I'm hearing that the OCZ stealthxtreme 600w has a decent chance of blowing up after a couple years and i am already 2 overdue. newegg alone has tons on reviews of long term failure and as ive been surfing forums it gets worse. =/
EaGle1337
05-08-2010, 05:59 PM
they're fsp epsilons enough said :P
silenteagle1
05-08-2010, 07:45 PM
I had an OCZGXS700. It died on me after 4 years(which was a week ago), it started acting funny after 3 1/2 years though. But then again it had a lot of stress put on it from having the house circuits being overloaded and tripping randomly(i told them not to plug that many space heaters in to one plug, lol).

Of course my guess is that the GXS was a little higher quality than a stealxtreme. My guess is that it will be fine, unless its started to act funny already.
Travis
05-08-2010, 10:53 PM
No crossfire and your PSU will be fine.
dangman4ever
05-09-2010, 12:07 AM
ok well i do wanted to add that im using 2 HDDs and i overclock and have 6 fans in my computer atm.

Please list out the specs for your PC as of this point in time. Include the exact CPU you're using.

For all intents and purposes, I would regard that OCZ StealthXStream as a 500W PSU PSU due it being based on the FSP Episilon platform.