Originally Posted by cApbAt
PCI-E Power connectors from the PSU. So am i right in thinking my PSU gives me a total of 80Amps on the 12 Rails, 20 on each of the 4 rails? That should be enough to power the card properly?
No, that's not how multiple 12V rails works. You can't add up the 12V+ rails like that because they are not 4 separate 20A power supplies.
Rather, all the power available comes from one source (it's probably more like around a 60A source on that PSU). And what the 'rails' actually are is just overcurrent protection (OCP) circuits on particular groups of wires.
So what that rating means is that on any one particular group of wires that constitutes a 'rail' (your 8-pin PCI-Ex cable might be one such group, as an example), if you pull more than 20A through that set of wires, the PSU (in theory) will shut off due to the OCP circuit being tripped.
So all the wires coming off the PSU are part of one of those four sets, and through any of those sets you can pull up to 20A. BUT ... not all at the same time, because like I say, the actual 12V supply is probably around 60A. Most quality PSU makers will also include a 'total' 12V amperage rating for the collection of 12V rails, but yours does not, so I have to guess based on past history ... usually you actually have around 75% of whatever the sum of the 12V 'rails' adds up to.
By the way, that unit of yours is actually made by Huntkey. Not a top-tier maker, but they do make a very good 900W unit. Not entirely sure if the one you have is the 'good' 900W unit they make or not, as typically the model I'm speaking of
has 5 12V rails at 18A each, not four at 20A each. Although the 'generic' version of it might be configured slightly differently
Do remember if the box it came in said anything about the unit being 80+ Silver efficiency by chance?
Anyway, worst-case w/it being a Huntkey is that it's actually more like a 700W unit that they rated at 900W. Still PLENTY of juice. Best case is it's their 'good' 900W unit in which case you are very much golden w/that PSU.
Now ... that was all just meant as a learning experience for you
It was NOT to tell you that I think the PSU is your problem here. The issue you describe, it's just not logical to believe that a lack of PSU power would manifest itself in this way. Lack-of-power issues will give you shut-downs when you put the system under load, or generally makes your system unstable. It really should NOT cause games to run better in Windowed mode vs. Full Screen mode.
You say the problem persists even if you run fullscreen at a lower resolution, right? How about if you just slam everything down to low (all the IQ settings) along with the res, does it go away then?
Have you tried a different cable to your monitor? If not, try one. Even trying a different monitor might be worthwhile to be honest.
I would also try downloading/installing the latest DirectX package
available from Microsoft.
Are you running any kind of mobo monitoring software like Asus Probe or Speedfan or the like? If so, turn it off.
If none of that (along w/running everything at 'stock' in your bios) fixes things, I'd try the card in someone else's machine, just to rule out a faulty card.
I don't understand your story about the ATI card I'm afraid
One paragraph you say the problem 'never existed', and then in the next, you say it actually did exist with the ATI card. But then by your description, it sounds like the ATI had the opposite problem from your current card.Edited by brettjv - 6/11/11 at 9:32am