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Written by David Ramsey   
Sunday, 22 May 2011
Table of Contents: Page Index
PowerColor PCS+ HD6950 Vortex II
Closer Look: PowerColor PCS HD6950
PCS HD6950 Detailed Features
Features and Specifications
Unlocking Extra Shaders
Video Card Testing Methodology
DX10: 3DMark Vantage
DX10: Crysis Warhead
DX11: 3DMark 11
DX11: Aliens vs. Predator
DX11: Unigine Heaven 2.5
DX11: Battlefield Bad Company 2
PCS HD6950 Temperatures
VGA Power Consumption
Vortex II Edition Overclocking
AMD Radeon HD6950 Final Thoughts
AX6950 2GBD5-PPV Conclusion

VGA Power Consumption

Your video card under load can easily consume more power than the rest of your system put together (depending of course on your CPU and how hard it's working). While even the Mighty Intel Core i7 980X pulls a maximum of 130 watts, a mid-range card like the PowerColor PCS+ Radeon HD6950 Vortex II Edition can easily use more than that, which is why AMD recommends a minimum of a 500 watt power supply when using just one of these cards. The days when you could build an enthusiast system with a 350 watt power supply are long gone.

But your computer probably spends a lot of time at less than maximum loads, and manufacturers are getting better at creating CPUs and GPUs that can dramatically reduce their power consumption at low loads or idle. Granted, giant dual-GPU cards like the Radeon 6990 can slurp up hundreds of watts of power, but make up about as large a percentage of the video card market as Hummer H1s do of the automotive market.

To measure isolated video card power consumption, Benchmark Reviews uses the Kill-A-Watt EZ (model P4460) power meter made by P3 International.

A baseline test is taken without a video card installed inside our test computer system, which is allowed to boot into Windows 7 and rest idle at the login screen before power consumption is recorded. Once the baseline reading has been taken, the graphics card is installed and the system is again booted into Windows and left idle at the login screen. Our final loaded power consumption reading is taken with the video card running a stress test using FurMark. Below is a chart with the isolated video card power consumption (not system total) displayed in Watts for each specified test product.

Video Card Power Consumption by Benchmark Reviews

VGA Product Description

(sorted by combined total power)

Idle Power

Loaded Power

NVIDIA GeForce GTX 480 SLI Set
82 W
655 W
NVIDIA GeForce GTX 590 Reference Design
53 W
396 W
ATI Radeon HD 4870 X2 Reference Design
100 W
320 W
AMD Radeon HD 6990 Reference Design
46 W
350 W
NVIDIA GeForce GTX 295 Reference Design
74 W
302 W
ASUS GeForce GTX 480 Reference Design
39 W
315 W
ATI Radeon HD 5970 Reference Design
48 W
299 W
NVIDIA GeForce GTX 690 Reference Design
25 W
321 W
ATI Radeon HD 4850 CrossFireX Set
123 W
210 W
ATI Radeon HD 4890 Reference Design
65 W
268 W
AMD Radeon HD 7970 Reference Design
21 W
311 W
NVIDIA GeForce GTX 470 Reference Design
42 W
278 W
NVIDIA GeForce GTX 580 Reference Design
31 W
246 W
NVIDIA GeForce GTX 570 Reference Design
31 W
241 W
ATI Radeon HD 5870 Reference Design
25 W
240 W
ATI Radeon HD 6970 Reference Design
24 W
233 W
NVIDIA GeForce GTX 465 Reference Design
36 W
219 W
NVIDIA GeForce GTX 680 Reference Design
14 W
243 W
Sapphire Radeon HD 4850 X2 11139-00-40R
73 W
180 W
NVIDIA GeForce 9800 GX2 Reference Design
85 W
186 W
NVIDIA GeForce GTX 780 Reference Design
10 W
275 W
NVIDIA GeForce GTX 770 Reference Design
9 W
256 W
NVIDIA GeForce GTX 280 Reference Design
35 W
225 W
NVIDIA GeForce GTX 260 (216) Reference Design
42 W
203 W
ATI Radeon HD 4870 Reference Design
58 W
166 W
NVIDIA GeForce GTX 560 Ti Reference Design
17 W
199 W
NVIDIA GeForce GTX 460 Reference Design
18 W
167 W
AMD Radeon HD 6870 Reference Design
20 W
162 W
NVIDIA GeForce GTX 670 Reference Design
14 W
167 W
ATI Radeon HD 5850 Reference Design
24 W
157 W
NVIDIA GeForce GTX 650 Ti BOOST Reference Design
8 W
164 W
AMD Radeon HD 6850 Reference Design
20 W
139 W
NVIDIA GeForce 8800 GT Reference Design
31 W
133 W
ATI Radeon HD 4770 RV740 GDDR5 Reference Design
37 W
120 W
ATI Radeon HD 5770 Reference Design
16 W
122 W
NVIDIA GeForce GTS 450 Reference Design
22 W
115 W
NVIDIA GeForce GTX 650 Ti Reference Design
12 W
112 W
ATI Radeon HD 4670 Reference Design
9 W
70 W
* Results are accurate to within +/- 5W.

The Z68 test system idled at 51 watts with no video card installed. The PowerColor PCS+ Radeon HD6950 Vortex II Edition card pulled 26 watts at idle (77-51) and 184 watts under FurMark load (235-51) for a combined total of 210 watts. This slots in just under the NVIDIA GTX560Ti reference design, which posts lower idle power consumption but higher load power consumption. These are very good results for performance at this level.



 

Comments 

 
# unlockingRealNeil 2011-05-23 08:32
You mentioned in the CONS section that you Couldn't unlock the extra shaders on this card.
Are there still new Radeon HD6950 cards out there that will unlock? I recall reading somewhere that a newer upcoming design would prevent that.
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# RE: PowerColor PCS+ HD6950 Vortex IIDavid Ramsey 2011-05-23 09:07
I'm sure there are, Neil, but I couldn't tell you wish specific ones are known to unlock. Even if a specific model from a specific vendor has unlocked in the past, there's no guarantee current stock will do this.
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# RE: PowerColor PCS+ HD6950 Vortex IIRory 2011-05-24 04:54
Great review thanks, and a small suggestion if I may...
We see a lot of reviews of these aftermarket OC editions on BMR.com (like the powercolor Vortex range and MSi with their Hawk and Lightning variants etc) But they are always pitted against the stock standard cards - or at best older and inferior cards in a crossfire/sli config.
This is useful of course, but the enthusiast in me would love to see a battle royale pitting the best OC variants from Powercolor, MSi, Gigabyte and co. 'Head to Head' to see who makes the best variant of the HD6950 &/or the GTX560ti
Just a thought :)
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# RE: RE: PowerColor PCS+ HD6950 Vortex IIOlin Coles 2011-05-24 08:29
Those stock-clocked products serve as a baseline, since there are numerous overclock models that add 1-10% more speed. It would be very difficult to compare all of the models, which is why we include our own overclock results to show how much of an impact overclocking has on FPS performance.
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# Voltage setting for this OC.Rock_n_Rolla 2011-05-25 02:15
Just want to ask, since this Powercolor 6950 Vortex II has a very nice cooling system capable of cooling the card set on high settings like you did, can we know how many millivolts you added based from its stock voltage? And, How long you tested this clock setting based on the applications you used in order for you to get the percentage???
Also, as you perform your tests, have you experience any hangs or crash?

A friend of mine is serious about buying this PC6850 2gig Vortex 2 card
although he's not into researching much about it on the internet for its real potential, perhaps this might be a good time to ask you so
i could tell him about the settings you used so he could used it on his
when he bought the card. And, if possible if you have tested the card
set to a much higher settings than the one you posted (930mhz and 1370mhz on memory) could you post it here including the voltage settings
and the performance it gained in percentage based from the stock. Thanks and God bless!
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# RE: Voltage setting for this OC.David Ramsey 2011-05-25 09:09
Actually, I didn't have to bump the voltage at all, although (as noted in the review) I did use AMD Overdrive to increase the maximum permitted current draw on the card.

I did not have any hangs or crashes with the overclocked settings I used as long as I kept the fans running full blast. If I left the fans on "Auto", the card would not complete most of the benchmarks when overclocked.

The overclock I achieved was exceptionally high for a 6950. I would not expect most examples to be able to overclock this well. Luck of the draw and all that.

The performance improvement using the overclocked settings is not only noted in each benchmark test, but summarized in a table at the end of the benchmarking section.
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# Screwlaxo 2011-12-13 00:00
hi, do you happen to know what kind/type of screw (the 4 screws that connects the heat sink fan/cooler to the pcb) that this card has? my other one is loose, and may have loose its thread for some reason. the card itself is fine, dont want to RMA just because of one screw acting up, any inputs from anyone will be highly appreciated. thanks in advance.
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# RE: ScrewDavid Ramsey 2011-12-13 07:57
No, sorry. I'd suggest removing one screw and taking it to a hardware or hobby store to see if they have something similar.
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# RE: RE: Screwlaxo 2011-12-13 16:29
Hi David, thanks for the prompt response, will do just that but I bet I'll have a hard time looking for those types. anyways I tried removing one of the screws and guess what, the 2nd one chipped on me, the screw head broke in to two. I know how gentle you need to be on this tiny screws but the build quality is just annoying. you might want to put that in your review, to be careful with the screws, Thanks again.
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# RE: RE: RE: ScrewDavid Ramsey 2011-12-13 16:45
That's annoying as hell...but I was able to remove and replace the cooler on my card without any problems...
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# RE: RE: RE: RE: Screwlaxo 2011-12-13 17:05
As much as I would like to think that these screws are a bad batch, its just insane. anyways I tried to squeeze the chipped screw head with my thumb and my pointer finger and guess what it broke again, now I have a quarter of the screw head, for some reason, I don't know why this happened, the only problem that I had with this card is I had my temp idle on 60C and load at 98C on BF3 ultra settings. so I tried to investigate and got to the loose screw, and no replies from power color if I can have a set of screws, my temps are normal right now. I just need the screws.
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# RE: RE: RE: RE: RE: ScrewDavid Ramsey 2011-12-13 17:13
I guarantee you those are not custom screws made for that specific card. Again, try a hobby shop or hardware store. Worse case you could get an entire new third party cooler...
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# RE: RE: RE: RE: RE: RE: Screwlaxo 2011-12-13 17:28
will do just that, thanks again!
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