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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 1125

post #11241 of 38701
Quote:
Originally Posted by DaClownie View Post

7970 doesn't use anywhere near 300w though. Just because it's rated that high doesn't mean it runs that high.
http://www.legitreviews.com/article/1834/11/

You also have to realize the Performance Drop off/ Rating for these PSU's.

A 850w PSU doesnt put out a Perfect 850w under load/stress, or when it gets warm.

90% efficiency at 100% load would put out around 765w~

Also, depends on if you have a decent Rail setup.
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post #11242 of 38701
Quote:
Originally Posted by SkateZilla View Post

Quote:
Originally Posted by DaClownie View Post

7970 doesn't use anywhere near 300w though. Just because it's rated that high doesn't mean it runs that high.
http://www.legitreviews.com/article/1834/11/

You also have to realize the Performance Drop off/ Rating for these PSU's.

A 850w PSU doesnt put out a Perfect 850w under load/stress, or when it gets warm.

90% efficiency at 100% load would put out around 765w~

Also, depends on if you have a decent Rail setup.

I'm almost positive efficiency works OPPOSITE what you think it does.

1000w PSU with 80% efficiency will pull 1200W from the wall, and supply 1000W of power to the devices, because it is 80% efficient. 90% would pull 1100w instead of 1200w.

EDIT: Or maybe 1250W 1000/80*100=1250w. and 90% efficiency would be 1111w from the wall.
Edited by DaClownie - 5/29/12 at 7:44am
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post #11243 of 38701
What would you guys recommend to be the best drivers for the 7950? I'm running 12.4 right now, but if something else performs better, I would LOVE to get some more performance out of this highly overclocked card.
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post #11244 of 38701
Quote:
Originally Posted by DaClownie View Post

7970 doesn't use anywhere near 300w though. Just because it's rated that high doesn't mean it runs that high.
http://www.legitreviews.com/article/1834/11/

Are you joking? Furmark test off a killawatt is what you call professional? Anytime you use a generalized power consumption test, the whole test becomes questionable nevermind that killawatt's are not accurate. On the other hand, take a look at TPU's consumption tests which are 100% more accurate because they measure the actual power draw of the cards off the pcie. Anyways, to play devil's advocate, take that 641 x .9 - 50w (for an idle cpu) divided by two = 263w. Now look at TPU.
Quote:
Originally Posted by tsm106 View Post

Where do you get this 220w overclocked number from??
Quote:
For this test we measure power consumption of only the graphics card, via PCI-Express power connector(s) and PCI-Express bus slot. A Keithley Integra 2700 with 6.5 digits is used for all measurements. Again, the values here reflect card only power consumption measured at DC VGA card inputs, not the whole system.
700
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post #11245 of 38701
Anybody have any idea when the EK blocks for the Lightnings are going to be available? Looking to start purchasing components soon and am trying to figure out if I should trade my cards for reference or stick with them and hope the blocks are available soon.

if I went reference I could get some Komodo's which is what I really want. What do you think will be better, reference with Komodo's or Lightnings with the EK blocks? Thanks!
post #11246 of 38701
Quote:
Originally Posted by Majin SSJ Eric View Post

Anybody have any idea when the EK blocks for the Lightnings are going to be available? Looking to start purchasing components soon and am trying to figure out if I should trade my cards for reference or stick with them and hope the blocks are available soon.
if I went reference I could get some Komodo's which is what I really want. What do you think will be better, reference with Komodo's or Lightnings with the EK blocks? Thanks!

Swiftech fullcovers are hyper restrictive man, do not want. I would wait.
Quote:
Four new Full-cover water blocks available soon - 07/05/2012

It's kind of a wait, but I would wait. You won't know what these lightnings are like before you get rid of them. Seems a shame to me.
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post #11247 of 38701
Quote:
Originally Posted by Majin SSJ Eric View Post

Anybody have any idea when the EK blocks for the Lightnings are going to be available? Looking to start purchasing components soon and am trying to figure out if I should trade my cards for reference or stick with them and hope the blocks are available soon.
if I went reference I could get some Komodo's which is what I really want. What do you think will be better, reference with Komodo's or Lightnings with the EK blocks? Thanks!

The ek blocks should be out in 2-3 weeks ("widely available") i have been litteraly checking their site everyday waiting for updates lol.

The ek blocks will provide better flow than the komodos which are pretty restictive. Temps will be about the same.
     
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post #11248 of 38701
Quote:
Originally Posted by tsm106 View Post

Quote:
Four new Full-cover water blocks available soon - 07/05/2012
It's kind of a wait, but I would wait. You won't know what these lightnings are like before you get rid of them. Seems a shame to me.

Just to add a note to this 7/5/2012 is actually May 7th, the day they posted that news. The news says "widely available early june"
     
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post #11249 of 38701
OK, tonality issue aside, I'll play along.
Quote:
Originally Posted by tsm106 View Post

Quote:
Originally Posted by DaClownie View Post

7970 doesn't use anywhere near 300w though. Just because it's rated that high doesn't mean it runs that high.
http://www.legitreviews.com/article/1834/11/

Are you joking? Furmark test off a killawatt is what you call professional? Anytime you use a generalized power consumption test, the whole test becomes questionable nevermind that killawatt's are not accurate. On the other hand, take a look at TPU's consumption tests which are 100% more accurate because they measure the actual power draw of the cards off the pcie. Anyways, to play devil's advocate, take that 641 x .9 - 50w (for an idle cpu) divided by two = 263w. Now look at TPU.
Quote:
Originally Posted by tsm106 View Post

Where do you get this 220w overclocked number from??
Quote:
For this test we measure power consumption of only the graphics card, via PCI-Express power connector(s) and PCI-Express bus slot. A Keithley Integra 2700 with 6.5 digits is used for all measurements. Again, the values here reflect card only power consumption measured at DC VGA card inputs, not the whole system.
700

Convenient use of one graph.

http://www.techpowerup.com/reviews/ASUS/HD_7970_CrossFire/22.html

In furmark (which in no way represents REAL COMPUTER USAGE crossfire 7970s peak at 525. Real world usage is under 400W. If you're stressing your 7970s in Furmark, you're not running prime95 at the same time. You test one and then the other, unless you're purposely trying to break stuff or overheat components if you have dual GPUs and a CPU in a single loop.

CPU/Motherboard/RAM overclocked = 200w (high side, but who cares right?)
Crossfire 7970s in extreme setting Crysis 2 gaming according to those charts = 375W (peak mind you, average was closer to 300w)

That's 575W. That leaves you with almost 300W for your 75 120mm fans and 2 SSDs. Enjoy.

Once again, misinforming people. 1000W is NOT NECESSARY for 7970 crossfire.

EDIT: Most high end PSUs power ratings is for RMA, which is their sustained power usage. They can usually peak MUCH higher if there's a burst of demand for that power.
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post #11250 of 38701
Quote:
Originally Posted by pioneerisloud View Post

1000w for 2 way crossfire 7970's, and Sandy Bridge? Really? doh.gif
7970's have a TDP of like 220w, not 300w (overclocked mind you). 2500k draws about 100w. Board maybe 20w. You can EASILY run crossfired 7970's off a good quality 650w. 850w will power tri fire fine.


Was going to say the same but you beat me to it... I did some testing a while back in this thread, i ran a 2500k at 1,4v with 4,7ghz and 2x7950 with a descent overclock...also 8 fans and 4-6 hdd.... even with prime95 and 3dmark11 running at ones i only saw like 600w one little peak... With stock gpus and only cpu overclocked i was no way near my 750w, maxed out at like 5xx something watt smile.gif
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