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Discussion Starter · #1 ·
So currently I have the system in my signature, with a single XFX HD 7850 2GB @ 1015/1375.

It's not really cutting it as far as performance goes, for my needs at least. I want better scores in things like the new unigene valley benchmark. On the extreme HD settings I average around 28 FPS. Playing Crysis 3 on all high (not ultra) settings with AA off, I get about 30-35 FPS, but in many areas it drops to a stuttering 15-20FPS and makes it rather unplayable.

I mean most other games I can just about max out for the most part, but I want even more headroom and to be able to turn AA up to max setting in all my games and still maintain a playable FPS. I game @ 1080p by the way.

So here's the deal. My spending limit for this upgrade is around $325.

My main problem right now with upgrading my graphics is my power supply. This is the power supply I have: http://www.newegg.com/Product/Product.aspx?Item=N82E16817148022

Output says: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]

Supposed to be "680W" but I doubt it's actually putting out that much, as with many power supplies. It's also only rated at > 70% efficiency which isn't all to fantastic.

Pretty sure that's not going to be enough amps for 2 HD 7850s in crossfire. Also, it says there is only 2 x 6 pin PCI Express connectors, but mine has 4 ? I dunno why. Still the same model, I still have the box and everything. My manual even states the same spec as only having two, but I still have 4 x 6 pin connectors. So while not having enough connections would have been a problem when going for crossfire, as the XFX HD 7850 require 2 x 6 pin, it's actually not an issue. So disregard that fact as connections won't be a problem.

So if I were to buy another HD 7850, I would also buy a new power supply, this one: http://www.newegg.com/Product/Product.aspx?Item=N82E16817153157

I know that would be sufficient for the crossfire.

But, for just about the same total price, actually a little less, I can buy an HD 7950 instead. I'm not sure if my power supply is adequate for one even after looking at tons of graphs, mainly because I'm not sure of amperage draw. I think it would be ok, but I'd like to hear opinions from others about it. My power supply isn't that fantastic by any means.

Opinions on what would be the better option ? I really want to get better graphics performance but many people dislike crossfire because of driver issues, game compatibility issues, stuttering etc., that I'm thinking the HD 7950 would be a better idea.

As far as what brand HD 7950 I would choose, I'm not sure. I'd also like opinions on what the best for the money is.

All 7950s come with Crysis 3 and Bioshock Inf. It's a pretty good deal, while the HD 7850 comes with Bioshock Inf. and Tomb Raider instead, along with 4GB of DDR3 but I'll have zero use for it.

Also, I want to note that I can't seem to overclock past my current cards settings. I had it set @ 1100/1400 and was playing the new Devil May Cry for around 20 minutes when my computer completely hard rebooted without any BSOD. I'm not sure if my card is just unstable at those clocks or if my PSU isn't enough for the higher overclocks.
 

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The PSU is very likely the reason you can't overclock, and it's probably just due to its poor quality. To be honest, I would replace the PSU first just because I think it's risky to be powering a nice system like yours with a low-quality unit like that. I wouldn't even recommend that PSU to an enemy. I doubt that it can even qualify as a 500W unit.

All that's needed to power your system with two 7850s is a quality-made 450W power supply:

http://www.guru3d.com/articles_pages/amd_radeon_hd_7850_and_7870_review,7.html

With one 7850 under full load, their PSU pulled 256W from the wall outlet. The 7850 pulled 106W by itself, so I have to add 106W to 256W for Crossfire, which makes the PSU pulling 362W from the wall outlet. The CPU was idling, so I have to add about 150W for the CPU, and so now the PSU would be pulling 512W from the wall outlet. Although, this is not cutting it close for a 550W power supply because if the PSU is 85% efficient while pulling 512W from the wall outlet, then the system is only pulling 435W from the PSU. Of course, your power draw while gaming will be closer to about 325-350W.

Now, I wouldn't say that this means that you can use the 680W Apevia unit because again, I think it's not safe to use it for a nice system like yours.
 

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OP your psu is not a high quality unit like a seasonic or antec or rosewill capstone . but the wattage and the amps on +12v rail seem quite good. with 22A and 24A on +12v rails it should be ok.

ATX-AS680W-BL

http://www.apevia.com/productsInfo.asp?KEY=ATX-AS680W-BL

but if you want to play safe get a rosewill capstone 550W 80 PLUS GOLD psu. very high quality psu with 45a on +12v rail. that more than enough for a single HD 7950 and FX 8350 based pc even with voltage overclocking.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182068

at the same clocks the HD 7950 is 5% slower than HD 7970. HD 7950 at 1100 mhz matches HD 7970 Ghz. HD 7850 at 1.15 ghz matches HD 7870. HD 7950 is close to 50% faster than HD 7850 at same clocks.

http://www.techpowerup.com/reviews/HIS/HD_7950_X2_Boost/31.html

BF3 1920 x 1200

HD 7870 - 53.8
HD 7950 iceq x2 boost - 67.5
HD 7970 Ghz - 78.9
HD 7950 iceq x2 boost(1210 mhz) - 82.9

grab this sapphire hd 7950 boost at USD 290. 270 after mail in rebate. good cooler. unlocked voltage. 29 cm long. so make sure you can fit this card in your case.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814202006
 

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Wow:

http://www.apevia.com/productsInfo.asp?KEY=ATX-AS680W-BL

APEVIA680W.png


It looks to me like they're trying to say that the +12V has a capacity of only 330W. I mean, let's look at it very carefully:

When you combine the +5V and +3.3V, you get 330W. Fair enough.

When you combine the +12V, +5V, and +3.3V (that is, when you add in the +12V), you get 660W. That's an additional 330W, and the only difference is now we have the +12V in the mix.

If this PSU's +12V capacity really is 330W, then it's just a low-quality 350W power supply at best.

When I see specification charts like this, all I see is evidence of a very low quality PSU that should be avoided at all costs - especially for modern-day systems.
 

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my guess is the unit will have no problems supplying the normal current of 16A and 18A (34A combined). the manufacturer has avoided giving a power rating for both +12v rails combined. OP while going for a high end graphics card you need a high quality psu for safety and stability. the rosewill capstone 550w at 45a on +12v rails is fantastic. very high quality with 80 PLUS GOLD rating.
 

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Quote:
Originally Posted by raghu78 View Post

my guess is the unit will have no problems supplying the normal current of 16A and 18A (34A combined). the manufacturer has avoided giving a power rating for both +12v rails combined. OP while going for a high end graphics card you need a high quality psu for safety and stability. the rosewill capstone 550w at 45a on +12v rails is fantastic. very high quality with 80 PLUS GOLD rating.
Rails are not combined like that though. So, it doesn't have a +12V capacity of 34A (and not 46A either).
 

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You can ask in the Power Supplies forum, but I think that this PSU is not safe to use at all - not for a nice system like yours.
 

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Quote:
Originally Posted by hatrix216 View Post

I believe you. I like the idea of upgrading mine, but I'm really just asking if crossfiring two HD 7850s is worth it ?

Cause then I will by a nice thermaltake and another HD 7850.
I wouldn't get just any Thermaltake PSU. I would rather recommend that you ask the Power Supplies forum with help in selecting a good PSU. It's not good to go by brand names.

Quote:
Originally Posted by raghu78 View Post

OP your current psu seems to be enough.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817148022

read the newegg user reviews. a user with a FX6100 and GTX 570 is using this psu.
I bet he's cutting it very close with this PSU. I sincerely doubt that it's really a 680W unit. To start with, that's its absolute maximum peak capacity. So that right there means that it likely has a continuous capacity of about 500W, and it can probably only do that up to 30°C.

Quote:
Originally Posted by raghu78 View Post

email them and ask them what is the max amps on +12v rail combined. if it can do 40A combined then you are safe. you should be able to power a FX-8350 and HD 7950.

http://www.apevia.com/contactus.asp#TS

you can ask in the power supplies forum too
I guess that's not a bad idea, but I doubt that Apevia is going to tell us what the +12V capacity is of their PSU. I doubt that they even know..
 

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Your in an interesting position. 7850 crossfire will out muscle even an overclocked 7950. However, you may or may not run into issues with crossfire. Your PSU isqquestionable and on 2 7850s I wouldnt chance it. And if your having issues now with a single 7850 and your power supply, a single 7950 will just be worse.
 

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Discussion Starter · #15 ·
Quote:
Originally Posted by FlawleZ View Post

Your in an interesting position. 7850 crossfire will out muscle even an overclocked 7950. However, you may or may not run into issues with crossfire. Your PSU isqquestionable and on 2 7850s I wouldnt chance it. And if your having issues now with a single 7850 and your power supply, a single 7950 will just be worse.
See that's what I was thinking. So I'm thinking it may just be a smarter idea to go the route of new PSU + another HD 7850 for crossfire.
 

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Quote:
Originally Posted by hatrix216 View Post

Ok I think I've decided on a PSU along with an HD 7950 since I really want to only run a single card. I'll make a post in the PSU forums about the one I'm thinking of buying.
I recommend also making a thread to ask only about your current PSU. Like, your subject line could be something similar to: "APEVIA ATX-AS680W-BL any good?" I predict that the real experts will be telling you that it is the death of your computer waiting to happen.
 

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Discussion Starter · #17 ·
Quote:
Originally Posted by TwoCables View Post

I recommend also making a thread to ask only about your current PSU. Like, your subject line could be something similar to: "APEVIA ATX-AS680W-BL any good?" I predict that the real experts will be telling you that it is the death of your computer waiting to happen.
I already believe that. I'm pretty sure it's the reason for my overclocking problems with both my CPU and GPU, so I'm ready to get a different one.

See now if I do crossfire another HD 7850, I would go with this PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006
 

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Quote:
Originally Posted by hatrix216 View Post

I already believe that. I'm pretty sure it's the reason for my overclocking problems with both my CPU and GPU, so I'm ready to get a different one.

See now if I do crossfire another HD 7850, I would go with this PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006
That is unnecessary overkill. All you need is a quality-made 550W PSU. You can get a high-end modular 550W PSU for that price. For example:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182262

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151119
 

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Discussion Starter · #19 ·
Quote:
Originally Posted by TwoCables View Post

That is unnecessary overkill. All you need is a quality-made 550W PSU. You can get a high-end modular 550W PSU for that price. For example:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182262

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151119
Problem is I need a total of 4 x 6 pin connectors. My HD 7850s both require 2 each. That limited my options to most of the higher wattage PSUs.

Actually this power supply seems to be a great deal because of the $20 off promo code: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182133

I know it's still a bit of overkill, but then I'll always have headroom for upgrades or new builds without having to replace the power supply.
 

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Quote:
Originally Posted by hatrix216 View Post

Problem is I need a total of 4 x 6 pin connectors. My HD 7850s both require 2 each. That limited my options to most of the higher wattage PSUs.

Actually this power supply seems to be a great deal because of the $20 off promo code: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182133

I know it's still a bit of overkill, but then I'll always have headroom for upgrades or new builds without having to replace the power supply.
You can use the Molex to PCI-E adapters. ;)

Or try this PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182263

Each new generation of GPUs and CPUs requires less power than the previous, so future upgrades are covered unless you run into so much money that you get like 2-3 top-of-the-line video cards. By then though, a high-end 650W unit like this would probably still be enough.
 
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