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Asus HD 7970 DirectCu 2 Top on 550watt psu?

post #1 of 17
Thread Starter 
I have recently bought a Asus HD 7970 DirectCu top (this one: https://www.asus.com/Graphics_Cards/HD7970DC2T3GD5/) and I am running it on my 5 year old antec true power 2 550watt psu.

Technically it should be enough to power my sig rig according to PSUCalc (http://psucalc.net/) however I did need to use one pci 6pin power connector and 2x4 pin connectors to make my second 8 pin connector for my graphics card.

My question is, should I be worried?

The card runs fine on stock settings however I do get vdroop underload from 1170mv to 1120mv. The 12v rail on the psu does not however drop under 12v.

All advice appreciated smile.gif
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post #2 of 17
I think you're fine, but 5 years is old for a psu.

Think about upgrading. All you'll need is a quality 450w if you decide to get a new one.
    
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post #3 of 17
Thread Starter 
Quote:
Originally Posted by MrTOOSHORT View Post

I think you're fine, but 5 years is old for a psu.

Think about upgrading. All you'll need is a quality 450w if you decide to get a new one.

Thanks for your reply, I am thinking of upgrading in the near future, but I would upgrade to something larger than 550watt to sorta "future proof" myself if I were to sli or cf in the future.

So you think that my PSU could be effecting my gpu voltage underload?
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post #4 of 17
Quote:
Originally Posted by DaNniii View Post

Thanks for your reply, I am thinking of upgrading in the near future, but I would upgrade to something larger than 550watt to sorta "future proof" myself if I were to sli or cf in the future.

So you think that my PSU could be effecting my gpu voltage underload?

I think so.

GPU voltage should just stay where it is under load.
    
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post #5 of 17
How are those two voltages being measured? Between which two points? If it's a software reading (which often get interpreted incorrectly by the software, are way wrong) or you don't know, then I wouldn't put too much stock into it. A little drop under load is to be expected, but if it's actually down to 11.2 V, then that's definitely not so spectacular. wait a sec, that's GPU core voltage of 1.17 V to 1.12 V, may be normal depending on design, or may not even be like that in reality

Five years isn't that long for a good power supply. However, it's way longer than a True Power 2.0 should be used. Those were one of the oldschool Antecs built by CWT that use the Fuhjyyu capacitors.

You should get a new power supply, even if it won't necessarily fix your problem—that is, if there's really a problem to begin with. Some droop from regulators is normal; depends on the design and load. If it's just how the card works, then a new power supply wouldn't fix that. You still want a new one though.
Edited by mikeaj - 5/31/13 at 5:34am
post #6 of 17
Thread Starter 
Quote:
Originally Posted by mikeaj View Post

How are those two voltages being measured? Between which two points? If it's a software reading (which often get interpreted incorrectly by the software, are way wrong) or you don't know, then I wouldn't put too much stock into it. A little drop under load is to be expected, but if it's actually down to 11.2 V, then that's definitely not so spectacular. wait a sec, that's GPU core voltage of 1.17 V to 1.12 V, may be normal depending on design, or may not even be like that in reality

Five years isn't that long for a good power supply. However, it's way longer than a True Power 2.0 should be used. Those were one of the oldschool Antecs built by CWT that use the Fuhjyyu capacitors.

You should get a new power supply, even if it won't necessarily fix your problem—that is, if there's really a problem to begin with. Some droop from regulators is normal; depends on the design and load. If it's just how the card works, then a new power supply wouldn't fix that. You still want a new one though.

Wow, thanks for your informative response +rep, I will definitely get one very soon, not sure what to get though... and I live in Australia so prices are very different. I was thinking of spending at around 150aus$ which would be at this store: http://umart.com.au/pro/products_listnew.phtml?id=10&bid=5&id2=140.

I was looking at something modular preferably, and I have considered the corsair, antec and seasonic 650-750w ones, not sure which one to get though... if possible I would really appreciate some help choosing since this will be an upgrade that wont happen again for some time.
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post #7 of 17
Surprisingly, a pretty good value there would be the FSP Aurum Modular 650W for $115 (online). There's also OCZ ZT 650W for perhaps an even better $95:
http://umart.com.au/pro/products_listnew.phtml?id=10&id2=140&bid=5&sid=92032
http://umart.com.au/pro/products_listnew.phtml?id=10&id2=140&bid=5&sid=84188

FSP Aurum Modular isn't as good as the higher-end models they and others sell, but it's decent. OCZ ZT is solid enough too and even cheaper. If you want to Crossfire 7970s, depending on overclocks and other system components, you might want say 750W though.

The prices there on the better Antec, Corsair, and Seasonic models are a bit much. If you want to go big, there's the Thermaltake Tough Power XT 775W for $134:
http://umart.com.au/pro/products_listnew.phtml?id=10&id2=140&bid=5&sid=57380

That model is kind of old, but it's still a good one. It's CWT DSG-based, similar to but a little worse than oldschool Corsair HX750 / 850, which are not worse than the updated V2 80 plus gold models.
post #8 of 17
Thread Starter 
I have personally never heard of FSP, however they do seem quite decent like you said, I may consider it.
I am also looking at the Corsair HX series

At the moment these are my preferred options:
Corsair HX 650v2: http://www.umart.com.au/pro/products_listnew.phtml?id=10&id2=140&bid=5&sid=96615
FSP Aurum 750w: http://www.umart.com.au/pro/products_listnew.phtml?id=10&id2=140&bid=5&sid=92037

Not sure which one would be the better product for the value.
Again all your help is much appreciated smile.gif
My Rig
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CPUMotherboardGraphicsRAM
i5 2300 @ 3.3ghz  Asus p8p67-M rev 3 Asus HD 7970 DC2T 1150/150 G-Skill 4x2GB 1333@1600 cl9  
Hard DriveCoolingOSMonitor
320gb 500gb 2tb Xigmatek HDT-S963 Windows 7 Ultimate x64  SyncMaster BX2250  
PowerCaseAudio
Corsair HX-650  Antec One Hundred z-2300 
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My Rig
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CPUMotherboardGraphicsRAM
i5 2300 @ 3.3ghz  Asus p8p67-M rev 3 Asus HD 7970 DC2T 1150/150 G-Skill 4x2GB 1333@1600 cl9  
Hard DriveCoolingOSMonitor
320gb 500gb 2tb Xigmatek HDT-S963 Windows 7 Ultimate x64  SyncMaster BX2250  
PowerCaseAudio
Corsair HX-650  Antec One Hundred z-2300 
  hide details  
Reply
post #9 of 17
Quote:
Originally Posted by DaNniii View Post

I have personally never heard of FSP, however they do seem quite decent like you said, I may consider it.
I am also looking at the Corsair HX series

At the moment these are my preferred options:
Corsair HX 650v2: http://www.umart.com.au/pro/products_listnew.phtml?id=10&id2=140&bid=5&sid=96615
FSP Aurum 750w: http://www.umart.com.au/pro/products_listnew.phtml?id=10&id2=140&bid=5&sid=92037

Not sure which one would be the better product for the value.
Again all your help is much appreciated smile.gif

FSP info

FSP Group was established in 1993 and nowadays stands as the 5th largest power supply vendor in the world.

FSP / Fortron cooperates as OEM with many companies (Thermaltake, Antec, BeQuiet!, Amacrox, etc) to provide quality products.

FSP is headquartered in Taiwan and has offices in Germany, U.K., USA, France, Russia, Japan, India, Korea and China.

I have seen many users spell FSP as FPS i think they need to stop playing Counter Strike
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post #10 of 17
Oh, I was just looking through stuff that was in stock.

The internals of the Corsair HX650 V2 are definitely better. But it's down 100 W and only gives you two PCIe power connectors natively. If you're spending that much, why cheap out on something you'll need to use adapters for to run two graphics cards?

Price difference between Aurum 650 W and 750 W is a bit much in my opinion.

FSP is a pretty large PSU OEM that makes units for many other brands. Most of those don't bother selling power supplies under their own name, but some like FSP, Seasonic, and in some places Super Flower do. FSP Aurum is okay but nothing special other than being relatively cheap for 80 plus gold yet being one of the worst-performing (still okay, nothing to be alarmed about) high-efficiency designs on the market; Aurum Modular has a couple small improvements on that.

The Thermaltake's a better option if you're serious about high-end Crossfire / SLI.
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