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I first had a GTX 680. OC version from Gigabyte. It is one of the few with custom PCB in addition to its custom cooler.
When the GTX 670 was lunch last week I also bought the same OC version from Gigabyte. It uses the exact same PCB and cooler from the GTX 680. In fact it has a sticker on the PCB to cover the 680 model number that was printed by the PCIe connector.
p1030912g.jpg

First I considered myself lucky with the Gigabyte GTX 680, I was able to overclock it to 1293mhz (core clock) that is above average for that card. I have tested three GTX 680: (1). This gigabyte, (2)EVGA Superclocked that only reach 1202mhz, and (3) a MSI Twin Frozr OC that was able to get to 1254mhz.
INTRO
First a few clarifications regarding overclocking this cards (nothing new)
I will not report clock offsets, only max clock. I have found that under load, the max clock is very stable. If you are not power constrained (increase power target) every card will reach its max clock under load and stay there without fluctuation.
This max attainable clock is different for each card and independent of the "nominal boost clock" that you get in the specifications of the card. In my experience all GTX 6x0 that I have tested go over the nominal boost clock to a intrinsic max clock that is variable from card to card but it does not change under any load.
The rule of gold is to try to maintain temp lower than 70C. As soon it gets to that temperature your max clock is decreased by 13mhz, and another 13mhz at 80C
When you increase the offset the max clock is increased by the specified amount until it is not stable anymore. But you are actually forcing your intrinsic max clock to any clock you desire.
Don't bother with volgate, when your card is under load at its max clock it will use its maximum available voltage automatically. You cannot force any higher voltage.

OVERCLOCKING RESULTS

Gigabyte GTX 680 OC
Max Clock: 1293Mhz (20.7% increase over its base clock 1071mhz -Factory OC)
Max Memory: 3204Mhz (6.6% increase over 3003mhz)

Gigabyte GTX 670 OC
Max clock 1354mhz (38.5% increase over base clock of 980Mhz- Factory OC)
Max Memory 3404Mhz (13.3% increase)

As it turns out that 670 is an good overclocker. Is the advantage in clocks enough to cover for its disable functional units in comparison with the 680? Let's see.

BENCHMARKS RESULTS

For all tests I used the following HW and Drivers
Procesador: i7-930 @ 3.52Ghz. MB: Gigabyte X58A-UD3R, RAM 6GB, 1600Mhz CAS 7-8-7
Nvidia drivers 301.34

UNIGINE HEAVEN
Settings: Tessellation Extreme, Anisotropy 16x, AA 8x, Resolution 1920x1080. Windowed mode.

Heaven Results for GTX 680 @ 1293/3204[/I]
Average FPS 50.9
Scores 1281
Min FPS 31.9
Max FPS 132.6

Heaven Results for GTX 670 @ 1358/3404
Average FPS 51
Scores 1286
Min FPS 32.7
Max FPS 131.3

3D Mark 11
Settings: "Basic" Performance test.

3DMark 11 Heaven Results for GTX 680 @ 1293/3204
3DMark Score P10101
Graphics Score 11204

3DMark 11 Results for GTX 670 @ 1358/3404
3DMark Score P9862
Graphics Score 10799

BATTLEFIELD 3
Settings All Ultra except MSAA (disable) only FXAA en High. Resolution 2560x1440
bf3n.jpg

BF3 Results for GTX 680 @ 1293/3204
Average FPS 68.6
Min FPS 43.7
Max FPS 113.4

BF3 Results for GTX 670 @ 1358/3404
Average FPS 67.5
Min FPS 40.8
Max FPS 111.4

CONCLUSIONS
From reviews we already knew that a Overclocked 670 could beat an stock 680. But comparing a good overclocked 680 with a good overclocked 670 shows that performance are very close.
Just check the forums to confirm that the 670 is a better overclocker than the 680. The difference in overclock overhead almost makes up for disabled SMX in the 670 providing 680 performance at a 80% of its price.
This specific Gigabyte 670 is a great deal because:
  1. It's a custom design but it does not cost more than the reference cards
  2. It uses the same PCB design than its big brother. Just the better power delivery gives you better opportunity to attain a higher overclocks
  3. The cooler is better way better than reference, 10C to 20C cooler, a critical point if you don't want to loose 13Mhz when reaching 70C. (unfurtunatelly I still reached up to 73C in BF3)
 

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The 670 is also good because its IN STOCK
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Awesome post man!

Welcome to OCN ... good to have you with us
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Quote:
Originally Posted by RJacobs28 View Post

Am I the only one left asking;
Why buy a 680?
If you assume the 670 has an average overclock of 1300 and the 680 has an average overclock of 1240, then the 680 is still about 5% faster, and assuming the 670 costs $400 and the 680 costs $500, then the 680 is 19% more expensive from a price/performance stand-point. So honestly, there's no reason to buy a 680 over a 670, except if you want the absolute best single-card and price is not important. But even then, i personally think a 7970 is superior to a 680 and it costs less, so then there really isn't a reason to buy a 680
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These new cards are absolute beasts! Why did I buy my 6950's this past december?
mad.gif
Lesson learned........wait for new lineup even when its 2-4 months away.
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Guys, between thes two GTX 670, Gigabyte OC vs Asus DCUii. Which one do you think can oc better? My assumption is DCUii perform better for cooling solution. While Gigabyte perform better in oc because they are using GTX 680 pcb for that card. Or my assumption is absolutely wrong?
 

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oh no upgrade again.. help guys. im about to sell my both gtx 580s and buy a single gtx 680 siganture BUT, i have read tons of post saying that is worthless to buy a gtx680 when you can get a gtx 670 that cost less and has equal or more performance.. so.. WHAT TO DO ?????? should i keep my current sli setup ? im on 27" 1080p monitor btw
 

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Umm, WHY? That would be stupid. He has them both overclocked to maximum stable. THAT's THE POINT OF OVERCLOCKING!!! You don't DOWNclock something just to see if you get similar results, when we obviously already KNOW the 680 has more hardware to it, CUDA cores and whatnot.

Point is, the 670 overclocks better, and therefore, for a couple frames per second on games is far superior to the 680 at $100-$150 cheaper.

And the 7970 provides no contest.
 

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I guess the drivers has changed the gap between the two cards. this thread is really old now.
I've seen several times GTX 680s at 12XX beating my GTX 670 at 1300 MHz.
If some member doesn't have problem benching his max stable overclock (on air) with my 670 on several games or benchmarks I will gladly share my results.
 

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Quote:
Originally Posted by Bosniac View Post

Should have ran both at same clocks and same memory. Comparison is kind of pointless otherwise.
I think the point was, considering the thermal limitations that the unlocked chip has (being the 680) this is actually allowing the 670 to overclock higher thus produce similar results.

If you want to see how they look running at similar clocks, there are a bazillion other reviews that compare them at stock and at similar clocks. We already know that the 680 will outperform them at the same clock.
 

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Quote:
Originally Posted by diaBoliQu3 View Post

Guys, between thes two GTX 670, Gigabyte OC vs Asus DCUii. Which one do you think can oc better? My assumption is DCUii perform better for cooling solution. While Gigabyte perform better in oc because they are using GTX 680 pcb for that card. Or my assumption is absolutely wrong?
Wanna know the same thing..
Anyone??
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Thank you for those results, I was up in the air about which of those two cards to get, I was wondering at each cards max oc if they would still be neck and neck, and it appears they are, so I think I'll be getting 670s instead of the 680s and save a couple bucks.
 

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Call it what you will, overzealous, flamboyance, irresponsible, I don't have to justify my decisions. At the end of the day, I have a GTX 680 4GB. Which is better than a 7970 at 80% of applications and has more VRAM, and better than a 670.

If your going to spend money on something, and have it to spend, why not get the best card you can? When purchasing a single GPU card, the GTX 680 is the best. Proven through testing and based on the percentage of applications it runs faster than the 7970 being higher. Better than 670, best single GPU card as of 01/25/13.
 
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