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<$200 GPU for a system with a 450W PSU? - Page 3

post #21 of 32
Quote:
Originally Posted by goobergump View Post
I know , just giving some input because I was on the verge of buying a gtx 460 as well, went 5770 instead. Haha also, I was there when I saw your sig quote about transferring the shuttle, did they take it down?
no idea my friend... no idea. I just hope for this shuttle to come home safely.
    
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post #22 of 32
Thread Starter 
Thanks for all the input, everyone. (And thanks for the offer Sohryu76, but I prefer not to buy used hardware. )

So it sounds like the consensus is, if I'm going to be stubborn and not upgrade my PSU , then the GTX 460 is a no-no, the 6850 MIGHT work but could easily be sketchy, and the GTS 450 and 5770 would probably be fine. Is that about right? (If so, I'm starting to lean towards this XFX 5770)

That seems to kind of gibe with what the power calculator that edalbkrad suggested says, although I'm having some trouble interpreting the results:

8800 GT (current card): 290W
Radeon HD 5770: 286W
GTS 450: 295W
Radeon HD 6850: 311W
GTX 460 1GB: 344W

(obviously I plugged in all my other system info as well, not just the card.)

The calculator says the ratings it gives are for continuously available power, not for peak power. I'm guessing my actual continuous power for my PSU is well below 450W, because otherwise you kind folks would not have expressed concern.

Antec claims that all their wattage ratings are for continuous power, but I don't know if that's true or if it applies to my (somewhat old) PSU.
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post #23 of 32
With that PSU, assuming its relatively new, you could handle a GTX460 or a HD6870 just fine, or any card less than that. The rest of your system REALLY isn't all that power hungry. Your PSU is roughly a 300-350w unit at best. Not the greatest. But it'll handle your dual core + the GPU's I listed above just fine.
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post #24 of 32
FWIW

I run a GTX 460 on a 350W PSU from Silverstone (single rail)
 
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post #25 of 32
If you don't OC anything, a low powered 6850 can run on it.
post #26 of 32
Quote:
Originally Posted by jcreigh View Post
Thanks for all the input, everyone. (And thanks for the offer Sohryu76, but I prefer not to buy used hardware. )

So it sounds like the consensus is, if I'm going to be stubborn and not upgrade my PSU , then the GTX 460 is a no-no, the 6850 MIGHT work but could easily be sketchy, and the GTS 450 and 5770 would probably be fine. Is that about right? (If so, I'm starting to lean towards this XFX 5770)

That seems to kind of gibe with what the power calculator that edalbkrad suggested says, although I'm having some trouble interpreting the results:

8800 GT (current card): 290W
Radeon HD 5770: 286W
GTS 450: 295W
Radeon HD 6850: 311W
GTX 460 1GB: 344W

(obviously I plugged in all my other system info as well, not just the card.)

The calculator says the ratings it gives are for continuously available power, not for peak power. I'm guessing my actual continuous power for my PSU is well below 450W, because otherwise you kind folks would not have expressed concern.

Antec claims that all their wattage ratings are for continuous power, but I don't know if that's true or if it applies to my (somewhat old) PSU.
Lots of people have horror stories of XFX about their rma and customer service. If you plan on getting a 5770 there's a lot of better options out there, I believe the Vapor-X is very close to that price. Search the egg for some better deals, last time I bought my 5770 (about a week ago) tons of instant $ off, along with MIR. In total my 5770 was $90. I wouldn't suggest even looking at the gts 450, 5770 instead. Someone said they were running their gtx 460 on a 350w by silverstone, maybe you could do that? GTX 460's are beast, by the way, what resolution are you running at?
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post #27 of 32
Weren't Smartpowers loaded with crapcaps? (Fuhjyyu IIRC)
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post #28 of 32
Thread Starter 
Quote:
Originally Posted by goobergump View Post
Lots of people have horror stories of XFX about their rma and customer service. If you plan on getting a 5770 there's a lot of better options out there, I believe the Vapor-X is very close to that price. Search the egg for some better deals, last time I bought my 5770 (about a week ago) tons of instant $ off, along with MIR. In total my 5770 was $90. I wouldn't suggest even looking at the gts 450, 5770 instead. Someone said they were running their gtx 460 on a 350w by silverstone, maybe you could do that? GTX 460's are beast, by the way, what resolution are you running at?
I run at 1680x1050.

Regarding XFX, the reason I was looking at them was the lifetime warranty. Of course, my EVGA 8800GT would have had a lifetime warranty too, if I had known I had to register within 30 days to get the warranty. Apparently XFX is the same way in that regard.

A couple people have chimed in and said that I could probably run a 6850, so I'm basically deciding between the 6850 and the 5770 at this point. I don't have anything against Nvidia, it's just that from the benchmarks I've seen, the cards that they have at the same price point perform slightly worse than their AMD equivalents. (eg, GTS 450 vs 5770 and GTX 460 vs 6850)
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post #29 of 32
If you insist on staying with the 450W SmartPower (I recommend replacing it first), then don't chance it: get the 5770. It'll still be a big upgrade in performance with the smallest risk of something going wrong thanks to the PSU.

However, I am still worried that the PSU may be a low quality unit. Unfortunately, there's a risk of a PSU failure with lower quality units which has a history of killing one or more of your computer parts (sometimes killing the entire system). Higher quality units are much safer because if they don't have enough power, then they just simply turn off and that's it. However, lower quality PSUs will turn off too, except they may also die in the process which is when anything connected to it could be killed at the same time. So the reason why a lower quality unit would turn off in such an event is because it died.

As you may be gathering from all of this, the power supply is the most important part in a modern system (yours is modern in this sense). If a lower quality unit can't cope with the stress of powering a computer system - especially when gaming - then the result could be PSU failure along with the death of one or more of your computer parts. I fear that the SmartPower may be a junker.

Earlier, you asked me how I know that it's probably nothing more than a modern-day 300-350W power supply. Before I get into it, it's important to know that modern systems (including yours) get most of their power from the +12V. The spec sheet says that the combined MAXIMUM capacity between the +5V, +12V1, 12V2 and +3.3V is only 410W. However, it also says that the combined output between just the +5V and +3.3V is 150W. So subtracting 150W from 410W leaves 260W on the +12V. Except, the first total is the "max" total while the 2nd one (the 150W total) is just the combined output - which almost sounds like a continuous 150W. Maybe. So I rounded up the possible +12V capacity to 300-325W which would mean that this PSU is just a basic 350W power supply at best (it's most definitely a 450W peak-rated unit).

Plus, the efficiency looks terrible too: it says that it's greater than or equal to 70% (it uses the "greater than or equal to" symbol), and this is usually a characteristic of a low quality PSU (or perhaps a much older unit).

Another thing I don't like is its MTBF: 80,000 hours at only 25°C. Now, 25°C is just 77°F which is pretty cold for a power supply! So that's like saying that as long as the PSU doesn't get used for more than just basic office applications, it should last a long time.

So I guess it's probably obvious by now that I would rather see you upgrade to a higher quality power supply before you upgrade to a better graphics card. It doesn't have to be some expensive 650W unit either! I mean even the 6850's power supply requirements say that a 500W peak-rated power supply is recommended for a system with a single 6850 in it! So that would mean that even a quality 450W power supply would be more than enough (meaning, not the 450W SmartPower).

You can take your maximum budget of $200 and spend about $70-$100 of it on a power supply, and then save up some more to get a really nice graphics card sometime after that. Try to think of it as an investment in some good protection for your system; after all, everything completely depends on the power supply.
Edited by TwoCables - 4/30/11 at 8:24pm
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post #30 of 32
After reading how in depth that was, and frankly true it is


screw the GPU, get a new PSU. He's right, your PSU can't handle any upgrade IMO.
 
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