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GIGABYTE Radeon HD 6850 GV-R685OC-1GD E-mail
Reviews - Featured Reviews: Video Cards
Written by Servando Silva   
Wednesday, 19 January 2011
Table of Contents: Page Index
GIGABYTE Radeon HD 6850 GV-R685OC-1GD
AMD Radeon HD 6850 GPU Features
Closer Look: GIGABYTE Radeon HD 6850
GIGABYTE HD 6850 Detailed Features
Video Card Testing Methodology
DX10: 3DMark Vantage
DX10: Crysis Warhead
DX11: Aliens vs. Predator
DX10: Just Cause 2
DX11: Lost Planet 2
DX11: Metro 2033
DX11: Unigine Heaven 2.1
Overclocking
VGA Power Consumption
AMD Radeon HD 6850 Final Thoughts
GIGABYTE HD 6850 Conclusion

VGA Power Consumption

Life is not as affordable as it used to be, and items such as gasoline, natural gas, and electricity all top the list of resources which have exploded in price over the past few years. Add to this the limit of non-renewable resources compared to current demands, and you can see that the prices are only going to get worse. Planet Earth is needs our help, and needs it badly. With forests becoming barren of vegetation and snow-capped poles quickly turning brown, the technology industry has a new attitude towards turning "green". I'll spare you the powerful marketing hype that gets sent from various manufacturers every day, and get right to the point: your computer hasn't been doing much to help save energy... at least up until now. Take a look at the idle clock rates that AMD programmed into the BIOS for this GPU; no special power-saving software utilities are required.

GV_R685OC1GD_GPU-Z_Sensors_tab.png

The HD 6850 works at 100/300MHz in idle mode, while VDDC lowers to 0.950 volts. At full load it increases frequencies to 820/1050 and VDDC goes up to 1.15 volts. The good part is that the HD 6800 series can be overclocked while keeping idle frequencies, saving some energy and keeping lower temperatures. This wasn't possible with HD5800 without modified BIOS.

To measure isolated video card power consumption, I used 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 computer system, which is allowed to boot into Windows 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 GIGABYTE GV-R685OC-1GD pulled just 29 (164-135) watts at idle and 148 (283-135) watts when running full out, using the test method outlined above. Consider PSU efficiency into the equations as I'm using an 80 plus bronze power supply. AMD has fixed the idle frequency problems that plagued the HD5xxx series, especially in CrossFireX mode. In idle mode, the BIOS needs to run the clocks WAY down, without any ill effects. We've become used to the low power ways of the newest processors, and there's no turning back.

I'll offer you some of final thoughts and conclusion on the next page...



 

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