Hey all,
I was unsure whether I should post this question under video cards or PSUs, but I guess it's really more of a power supply question.
I'm still kind of a novice builder and, admittedly, the differences between PSUs and, indeed, the whole concept of power requirements has been rather foreign to me. For the past four years or so, I've been running a 550w Rosewill PSU (Newegg link). As far as I could tell, it's been doing just fine. I run a reasonably modest system, only dabbled in overclocking a little, 3.0 Intel Core 2 Duo, 4 gigs memory, and a Geforce 9600 GT. I have a handful of case fans and such, but nothing out of the ordinary. Never seen a BSOD or anything with this one.
But, recently, I tried to do a video card upgrade with rather... catastrophic results. I got myself a Radeon HD 6850 and, within five minutes of installation, my entire system instantly powered down and refused to come back to life until I removed the card. I assumed it was a problem with the card since, after that, no matter what, the system wouldn't even attempt to power up with the thing in (I can't imagine why it would power up the first time if it wasn't a problem with the card directly). So, I returned the card and (after seeing how much it would cost me to ship it a second time) I decided to get my money back and go a different route.
But, it got me thinking... Maybe it did have something to do with the PSU? I'd certainly like to avoid the same situation with another card. So, I did a little sleuthing. My first confusion came in the form of amp requirements. I found this handy-dandy list: here, and realized that my old 9600 GT card had a minimum requirement of 26A on the +12V rail. My PSU has two +12V rails listed @ 18A each. For about an hour of internet study, I had no idea what this meant, but I gather now that it basically means that I can handle a minimum requirement up to 36A (even if that's not a particularly good idea), which is why it had no problem with the 9600 GT. Interestingly, the same list suggests that the HD 6850 only requires 25A and the same wattage. That seems to support the theory that I just had a faulty card.
So, while my PSU may be a little on the whimpy/old side, all the data I've seen so far seems to suggest that I'd be fine with most mid-range cards, as long as I keep clock speeds normal and don't try any SLI/Crossfire tricks. But, I'm still skeptical. I'm thinking of going back towards nvidia cards after that experience, so I have my eyes set on a GTX 460. From that earlier list, the minimum power requirements are supposedly exactly the same as my 9600 GT. However, I did some studying on some charts here at Tom's and it looks like the GTX 460 can demand a full 70 more watts (when going full-steam) compared to the old card. Hence, my hesitation.
So, any opinions? Does it sound like I'll be okay? Is there a factor here that I'm not looking at? Am I just being paranoid? I'm sure there are plenty of other reasons I should go ahead and upgrade the PSU, but for this situation, I just want to know if I can pull it off with what I have before I start throwing money every which way.
Thanks in advance!
Edit: Just noticed this right after posting, and feel a little silly Still, any opinions on this particular situation would be appreciated, particularly if I'm wrong about 2 +12V rails being added together. From the looks of it, the card I have my eye on (the 460) and the card that failed (the 6850) both have a minimum recommendation of 36 amp on this list. I have the feeling I'm playing with fire at that kind of requirement... Does anyone know what the amp recommendations for the 9600 GT were?
I was unsure whether I should post this question under video cards or PSUs, but I guess it's really more of a power supply question.
I'm still kind of a novice builder and, admittedly, the differences between PSUs and, indeed, the whole concept of power requirements has been rather foreign to me. For the past four years or so, I've been running a 550w Rosewill PSU (Newegg link). As far as I could tell, it's been doing just fine. I run a reasonably modest system, only dabbled in overclocking a little, 3.0 Intel Core 2 Duo, 4 gigs memory, and a Geforce 9600 GT. I have a handful of case fans and such, but nothing out of the ordinary. Never seen a BSOD or anything with this one.
But, recently, I tried to do a video card upgrade with rather... catastrophic results. I got myself a Radeon HD 6850 and, within five minutes of installation, my entire system instantly powered down and refused to come back to life until I removed the card. I assumed it was a problem with the card since, after that, no matter what, the system wouldn't even attempt to power up with the thing in (I can't imagine why it would power up the first time if it wasn't a problem with the card directly). So, I returned the card and (after seeing how much it would cost me to ship it a second time) I decided to get my money back and go a different route.
But, it got me thinking... Maybe it did have something to do with the PSU? I'd certainly like to avoid the same situation with another card. So, I did a little sleuthing. My first confusion came in the form of amp requirements. I found this handy-dandy list: here, and realized that my old 9600 GT card had a minimum requirement of 26A on the +12V rail. My PSU has two +12V rails listed @ 18A each. For about an hour of internet study, I had no idea what this meant, but I gather now that it basically means that I can handle a minimum requirement up to 36A (even if that's not a particularly good idea), which is why it had no problem with the 9600 GT. Interestingly, the same list suggests that the HD 6850 only requires 25A and the same wattage. That seems to support the theory that I just had a faulty card.
So, while my PSU may be a little on the whimpy/old side, all the data I've seen so far seems to suggest that I'd be fine with most mid-range cards, as long as I keep clock speeds normal and don't try any SLI/Crossfire tricks. But, I'm still skeptical. I'm thinking of going back towards nvidia cards after that experience, so I have my eyes set on a GTX 460. From that earlier list, the minimum power requirements are supposedly exactly the same as my 9600 GT. However, I did some studying on some charts here at Tom's and it looks like the GTX 460 can demand a full 70 more watts (when going full-steam) compared to the old card. Hence, my hesitation.
So, any opinions? Does it sound like I'll be okay? Is there a factor here that I'm not looking at? Am I just being paranoid? I'm sure there are plenty of other reasons I should go ahead and upgrade the PSU, but for this situation, I just want to know if I can pull it off with what I have before I start throwing money every which way.
Thanks in advance!
Edit: Just noticed this right after posting, and feel a little silly Still, any opinions on this particular situation would be appreciated, particularly if I'm wrong about 2 +12V rails being added together. From the looks of it, the card I have my eye on (the 460) and the card that failed (the 6850) both have a minimum recommendation of 36 amp on this list. I have the feeling I'm playing with fire at that kind of requirement... Does anyone know what the amp recommendations for the 9600 GT were?