[Warning Fudzilla] GeCube HD 2900XT beats 8800GTS 640MB

Tom|Nbk · 7 Jul 2007 at 16:30

willhub said:
I would think someone is pushing it running a HD2900XT and C2D system with the Hiper though.

No will the Hiper is more than up to the task, I also ran Crossfire 1900's for 5 month's on this

Margaret · 7 Jul 2007 at 16:32

fornowagain said:
the Antec 500W (assume its a Paxpower?) has less 12v wattage (relatively large 3.3.v & 5V rails).

If you're talking to me here then I've got the Akasa 500W Paxpower just took this pic:

Tom|Nbk · 7 Jul 2007 at 16:37

Here we go:

Idle 232W :

In Game 384W (390W Peak) :

Margaret · 7 Jul 2007 at 16:39

Very nice.

Plus just noticed how cheap that Zalman is, absolute steal.

fornowagain · 7 Jul 2007 at 16:40

Jihad said:
If you're talking to me here then I've got the Akasa 500W Paxpower just took this pic:

Um, I was 10W out, it has 24.1A/290W@12V. That's getting on the light side. Don't forget most of the consumption on a modern PC is at 12V.

Tom|Nbk · 7 Jul 2007 at 16:41

Jihad said:
Plus just noticed how cheap that Zalman is, absolute steal.

Hell yea. £30 Inc del bargain!

willhub · 7 Jul 2007 at 16:41

How does that unit monitor power? I am thinking of buying one of those Zalman fan controllers, they look cool

.

fornowagain · 7 Jul 2007 at 16:45

willhub said:
How does that unit monitor power? I am thinking of buying one of those Zalman fan controllers, they look cool .

Iirc it has an adapter that plugs in between the PSU and mains lead. So take the PSU efficiency into account with the figures as well. Tom's using around 300W@12v

Tom|Nbk · 7 Jul 2007 at 16:45

willhub said:
How does that unit monitor power? I am thinking of buying one of those Zalman fan controllers, they look cool .

You get a little CVS box which you plug your mains into and then from the CVS box there is a usb lead and a plug to plug into your PSU, you then plug the usb from the cvs box into a bracket at the back of your pc which feeds into the controller.

Tom|Nbk · 7 Jul 2007 at 16:47

fornowagain said:
Iirc it has an adapter that plugs in between the PSU and mains lead. So take the PSU efficiency into account with the figures as well. Tom's using around 300W@12v

Which leaves me with 60w headroom, which means the Hiper aint even sweating yet

Margaret · 7 Jul 2007 at 16:48

fornowagain said:
Um, I was 10W out, it has 24.1A/290W@12V. That's getting on the light side. Don't forget most of the consumption on a modern PC is at 12V.

Uh oh!

fornowagain · 7 Jul 2007 at 16:49

Tom|Nbk said:
Which leaves me with 60w headroom, which means the Hiper aint even sweating yet

83%, yeah thats going to be around the most efficient point and not to heavily loaded. I wouldn't put to much more on there though!!

Tom|Nbk · 7 Jul 2007 at 16:51

fornowagain said:
83%, yeah thats going to be around the most efficient point and not to heavily loaded. I wouldn't put to much more on there though!!

Will be leaving everything as it is now, so that's great

Margaret · 7 Jul 2007 at 17:10

fornowagain said:
Um, I was 10W out, it has 24.1A/290W@12V. That's getting on the light side. Don't forget most of the consumption on a modern PC is at 12V.

How do dual 12v rails get taken into account may I ask?

Never really quite understood PSU's and rails.

fornowagain · 7 Jul 2007 at 17:17

Jihad said:
How do dual 12v rails get taken into account may I ask?

Never really quite understood PSU's and rails.

The fundametal thing to know is that a 'rail' as its used in this context refers to an overcurrent limiter and that both rails are connected to the same 12v source. So you can't get more out than you put in!! With your PSU (there are exceptions), when it says 12V1-18A, 12V2-18A it means each output will supply upto 18A before tripping out. But not both at the same time, total's 24A so:

18A + 6A
6A + 18A
12A + 12A

And so on.

Tom|Nbk · 7 Jul 2007 at 17:21

The worst thing that can happen is your system dosnt boot or you get a message on screen telling you about the PSU, not like it's going to go boom.

fornowagain · 7 Jul 2007 at 17:27

Tom|Nbk said:
The worst thing that can happen is your system dosnt boot or you get a message on screen telling you about the PSU, not like it's going to go boom.

Not wishing to correct you, but the worst thing is that it runs, but maxed or overloaded. 105% may not trip, just gets hot and dies in a firey explosion taking out half a city block. Ok a slight exaggeration. As you say a good psu will just drop out, but some can run for quite a while overloaded and do a lot of damage when they fail. Usual sign is a massive voltage droop on the rail. Measure with a multimeter, don't believe the software readings unless verified, ATX spec is 5% of nominal (personally I'd want better than that tbh)

Margaret · 7 Jul 2007 at 17:30

Ah I kinda get it then, well fingers crossed I know there are people using GTS' on this PSU so lets hope it can go the little bit more for the GTX. :eek:

Kinda wish I didn't buy a new hard drive just incase my PSU isn't up the task now.

Cyber-Mav · 7 Jul 2007 at 18:31

iv got some old macron psu;s and iv hooked up to a car amplifier and at lowish gain the psu just shuts off cuz the current draw is too much for it to handle. most psus should have over current protection so if you pull too much the psu just shuts down.

fornowagain · 7 Jul 2007 at 19:01

Those kind of shut down protection circuits are mainly for dead shorts and surge loads. I've seen plenty of rails run well over their stated current limit. OCP is just not that accurate, its quite possible to run at 105%. Just watch them get very hot. The better psu manufacturers under-rate the device, some don't. Best not to run near maximum for too long, if you do keep an eye on the psu temps, that's the killer. They can derate 20% for every 10C above testing nominal. E,g, a 500W psu tested at 50C is a 400W psu at 60C.