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Watercooling Battle: 680GTX vs 7970 *Results Inside*

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Introduction

I purchased my EVGA 680GTX the day of launch and slapped an Aquacomputer waterblock on it as soon as they came out. As most of you know, there isn't a good way to heavily overclock a 680GTX. However, I've enjoyed a quiet, cool running liquid cooled PC for a while and couldn't stand the tiny air cooler on the stock card. The 680GTX does enjoy some bonuses when watercooled, so there is merit in adding the waterblock. Can't beat a temp in the 30's daily.

I bought a 7970 with a Koolance waterblock from a fellow enthusiast to see what all the fuss has been about with regards to the overclockability of the 7970. I ran a series of tests to see how each card stands when watercooled, since it is hard to find a face-off between these two cards in a water cooled rig. Enjoy.

System Specs

System:
Win 8 64 bit
16GB RAM DDR31600
2500k@4.2Ghz
Z68 Motherboard
Corsair TX750
Corsair 800D

Cards:
Gigabyte R7970C-3DG
EVGA 680GTX Standard

Cooling:
Rad- EX360
Rad Fans- 3xYate Loon Mediums
Pump- DDC-1
Tubing- Tygon 3/8
Fittings- Bitpower Silver Comps
Res- EK 250mL
CPU Block- XSPC Raystorm

Graphics Waterblocks:
7970- Koolance full cover
680GTX- Aquacomputer full cover

Methodology

The 680GTX was already installed. I updated to 314.21 beta drivers for the tests. Five minutes was given between each test to ensure that the temps stabilized before running the next test. All the Nvidia drivers were cleaned by hand after the installation of the 7970. Catalyst 13.3 beta drivers were installed.

Installation

EVGA 680 with Aquacomputer full cover waterblock

The 7970 is certainly the better made board with more expensive components and small touches such as the GPU crossbrace. My 680GTX only has 2x6pin power connectors while the 7970 has 8+6pin. As for the waterblocks, the Aquacomputer block is simply a work of art. It is a fine looking piece of kit. The cuts are very crisp and the fit is very tight. What's great about it is how low-profile it is compared to other waterblocks. The Koolance, on the other hand, is larger and more gaudy although it does not weigh as much as the aquacomputer block. While the aquacomputer block is mostly copper, the koolance is comprised of stainless, aluminum, and some copper.

Gigabyte Reference 7970 with Koolance full cover waterblock, its a bit longer

Tests

I have access to a ton of games, but not many are installed. I was wanting to run Crysis 2 and Battlefield 3, but I didn't have them installed. At over 30GB between the two, I decided to dig around in some older games instead.

FurMark: I like FurMark because it is quick and dirty. The test only lasts about 45seconds and there aren't any splash screens or adverts to wade through to started testing. I used the 720P benchmark to test the cards and I checked stability by running for 5 mins while overclocking, although some games still had issues that I had to address with a downclock.

3DMark11: This bench is an easy choice to run. I used the performance preset because I do not have the full version. My CPU isn't the best at the physics portion because its not an i7.

Sleeping Dogs: I ran Sleeping Dogs at 1440p with all the settings on High except AA on medium. Sleeping Dogs did not like my +200 offset on the 680GTX, so it had to be scaled back to +150 during the OC run.

Batman: I ran Batman with and without Physx. IMO the game looks pretty bad without physx, so an AMD card is pretty worthless here. Without physx is a good benchmark for most Unreal Engine 3 games, so it was worth doing anyway. Settings were 1440p, all high, normal physx when using physx, and 8x AA.

Crysis: The preset benchmark tool was used.

Overclock/Temp Results

7970 Overclocking
I used the MSI Afterburner tool with the XCL tweak to unlock voltages and higher OCs. I was able to run at 1300Mhz on the core and 1600Mhz on the memory with 1237mV. I could certainly go higher, but wanted to find a nice middle ground for a "daily overclock."

680GTX Overclocking
I was using the EVGA Precision tool but the OC would not take for some games. The OC would be set but the game would run at stock settings. Switching to MSI afterburner eliminated that issue. I was able to run stable at +200 clock offset and +500 memory offset. The card is screaming for more voltage because the temps never exceed 40C. I had to downclock a little bit during Sleeping Dogs. With the offset, I would hit between 1228-1267Mhz during testing.

Temps

The Performance Results



Discussion

The 7970 is a hell of an overclocker. I was blown away by the amount of performance that the card has locked away. It reminds me of my old 470, that thing was a powerhouse on water nipping at the 580. It reinforces the disappointment that I have in nvidia locking up the voltage in the 680's. The 680 is a great card, but seeing it chugging along at 33C in most games at my max OC is a constant reminder that there is a lot more performance left on the table with a bit of voltage.

The 7970 has a bit of coil whine that my 680GTX absolutely did not have. It isn't annoying, but its there. The 7970 also doesn't like to show the BIOS screen when hooked up via DisplayPort. It will when I hit "DEL" to enter the BIOS but it takes a few moments to show.

Something that surprised me that I wasn't expecting was the visual difference between the 7970 and the 680. Sleeping Dogs and Batman looked better visually on the 7970. The colors were deeper and the shader effects looked more pronounced. I did not notice any difference in Crysis. There used to be a rule of thumb that ATI drivers looked better than Nvidia drivers. I was surprised to still see a difference in quality.

The temperatures were lower on the 7970 than I expected. Seeing that there is probably 100W more power flowing through the 7970 than the 680GTX, I would have thought the temps would show a bigger difference. I believe I have more headroom with my 7970 overclock, but I didn't want to go too far with the voltage without further research.

Decision

Which card do I keep? That is a tough decision. The performance is obviously better with the 7970, but I've never had issues with the performance of the 680GTX keeping me back. There's something about the cool, low power, and simple? design of the 680GTX. Having the voltage locked makes me set the Offsets and then leave it alone. With the 7970, I'll constantly be wanting to tweak a bit more out of it. The 680GTX has sat in my PC, whispering away since its launch one year ago to the day of this post.

The performance of the 7970 is better with my setup and the longevity of the card is most likely greater with its better specs and more vRAM. I know, however, that when the next gen of cards launches that I will be purchasing on day one, so chasing that mythical long-term card is a moot point.

Help me decide!

PS Could bitcoin mine with the 7970 and make money...
 
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post #2 of 11
In to scream about the AMD latency issues biggrin.gif

Regarding the washed out NV colors, there's an obscure setting in the NVCP that will fix that.

It's almost a waste to not WC a 7970, man they love low temps.



You could sell the 680, go CFX and make enough money a month to buy more 7970s thumb.gif

What I'm making right now if the x rate stays about the same...


Edited by grunion - 3/22/13 at 9:40pm
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post #3 of 11
Quote:
Originally Posted by subyman View Post

I ran a series of tests to see how each card stands when watercooled, since it is hard to find a face-off between these two cards in a water cooled rig

Check this out. I have to ask why you didn't run an apples to apples test with matched clocks?

http://www.overclock.net/t/1322119/12-11-vs-310-33/0_40
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post #4 of 11
Just saying the temp part is irrelevant. Ya a 7970 can OC but the temp part? Koolance compared to aquacomputer? Open up the aqua block and you could fit a person in those deep drooly awesome channels. The aquablocks are just under the heatkillers. That's why your 680 is running cooler. Put an aquacomputer on the 7970 and you'll see the temps drop more.
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post #5 of 11
I have always found amd to have deeper and nicer default colors. However I believe Nvidia's are more accurate. Also you can adjust either to match.
post #6 of 11
About the colors... What "grunion" is referring to can be found in my sig. thumb.gif
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post #7 of 11
Quote:
Originally Posted by tsm106 View Post

Check this out. I have to ask why you didn't run an apples to apples test with matched clocks?

http://www.overclock.net/t/1322119/12-11-vs-310-33/0_40

yikes! extreme aa in sleeping dogs.
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by tsm106 View Post

Check this out. I have to ask why you didn't run an apples to apples test with matched clocks?

http://www.overclock.net/t/1322119/12-11-vs-310-33/0_40

The clocks were close. My 680 was running at 1267 while the 7970 was at 1300. The 680 liked to jump around a lot more than the 7970. I wanted to push them both to the highest daily OC I could comfortably get at to see how they stacked up. I wouldn't mind running some more tests, but I doubt I will have a day to dedicate before I choose which one to keep.

Quote:
Originally Posted by specopsFI View Post

About the colors... What "grunion" is referring to can be found in my sig. thumb.gif

I'm using DisplayPort, but it has me interested in messing around with the nvidia drivers. I noticed my games always looked slightly washed out compared to my friends that have AMD, especially Dead Island.
 
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post #9 of 11
I always upped Digital Vibrance.

According to these guys there is no difference:

"
Color Test

For this test I’ll use a variety of color patches, one of each bright primary and secondary colors, as well as three pastels and two neutral colors. Colors are measured on the standard CIE chart and expressed in terms of xy for color coordinates and Y for luminescence (brightness).

http://sycraft.org/fonts/chart-1.png

Looking at the charts, you can already see that most colors are dead on with regards to the x and y value, and very close on the luma (Y) value. In fact, what you see here is as perfect a match as this setup can measure. The meter is not a perfectly accurate device to begin with, and is also slightly affected by temperature. Also, there are small variations across a screen, and I don’t place it on precisely the same spot every time I take a reading. A difference of +- 0.001 xy is normal, and in fact below the rated error for this device. It is also completely unnoticeable.

To quantify if a difference is noticeable, the difference between the measurements can be expressed by a value called delta E. This is a calculation of the perceived difference between two colors to the human eye. A value under 4 is generally unnoticeable to most observers for most colors. A value of 2 or under is considered acceptable for print. A value of 1 is the lowest perceptible difference level for any color, hence why it is 1.

http://sycraft.org/fonts/chart-2.png

As we can see, the highest delta E for the readings is 0.34, and most are under 0.2, well below a perceptible level and getting around the margin of error of the colorimeter. I am quite sure we’d have an even closer match with better equipment and a precise aim on the monitor. The very, very small differences we are seeing are a result of imperfect measurement equipment, not any actual difference.

So as we can see, colors coming from AMD and nVidia cards are dead identical to within the limits of this test, and to within the limits of human perception. This is what we’d expect given the completely digital nature of all the connections: A given input value will be the same output value, unless something changes it along the way.

If you think you see a difference with your new card, you may want to check your color settings. To be sure, video cards can change color output, when you ask them to. However with everything turned off, they should look completely the same."
Edited by Zarich - 3/23/13 at 11:38am
post #10 of 11
Quote:
Originally Posted by grunion View Post

In to scream about the AMD latency issues biggrin.gif

Regarding the washed out NV colors, there's an obscure setting in the NVCP that will fix that.

It's almost a waste to not WC a 7970, man they love low temps.



You could sell the 680, go CFX and make enough money a month to buy more 7970s thumb.gif

What I'm making right now if the x rate stays about the same...


How its that possible? With my cf i am around 1400 mh/s.Or its with 4 7970? biggrin.gif
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