My experience watercooling the EVGA GTX780 Classified

[SimsReaper]

Subbing this thread. I may be asking for some advice on getting a notch more out of my 780. Its under water with a XSPC block, oc'd to 1123/1603. But all at stock voltage. I'm currently upgrading to a new case, dual wc loops with another 780 in sli.

 

[guskline]

Subbing this thread. I may be asking for some advice on getting a notch more out of my 780. Its under water with a XSPC block, oc'd to 1123/1603. But all at stock voltage. I'm currently upgrading to a new case, dual wc loops with another 780 in sli.

What program are you using to overclock? Precision, MSI, Nvidia Inspector?

 

[guskline]

For now I've settled for +100 core and +200 mem under Precision.

 

[Face2Face]

For now I've settled for +100 core and +200 mem under Precision.

So what clocks does that give you at full boost while gaming?

 

[guskline]

So what clocks does that give you at full boost while gaming?

I'll check tonight and get back to you.

 

[Subyman]

For now I've settled for +100 core and +200 mem under Precision.

Have you played with the voltage yet? The best part about water-cooling is being able to crank the voltage a bit. These cards love a bit more voltage for a good over clock.

 

[guskline]

So what clocks does that give you at full boost while gaming?

What software do you use to measure that?

 

[guskline]

Have you played with the voltage yet? The best part about water-cooling is being able to crank the voltage a bit. These cards love a bit more voltage for a good over clock.

I've used the EVGA Precision voltage software and set it to max.

 

[blackened23]

Give this a shot, the voltage tool within precision is limited like the one in afterburner. I think the one found in precision is just a general 780 over-voltage tuner, which is limited to +37mV (not sure if that's the limit with your BIOS).

Classified voltage tuner (specifically for classified 780/780ti):

http://www.overclock.net/attachments/19143

Full classy thread: http://www.overclock.net/t/1411500/official-evga-classified-owners-club

That one should give you way more over-voltage headroom, and temps won't be an issue for you.

 

[guskline]

Thanks blackened23

 

[guskline]

I now have flashed the BIOS to skyn3t rev 4 and WOW. Base clock is 1111Mhz and boost is disabled. I run core at @1270 and memory at +350 on Precision. The temps are solid 29C idle 39-40C Max.

3D Firestrike is @10800

 

[KaRLiToS]

I now have flashed the BIOS to skyn3t rev 4 and WOW. Base clock is 1111Mhz and boost is disabled. I run core at @1270 and memory at +350 on Precision. The temps are solid 29C idle 39-40C Max.

3D Firestrike is @10800

Great choice mate. Skynet BIOS are solid.

First thing I did with my Zotac GTX 780 Reference and my MSI GTX 780 Twin Fozr Gaming OC is flash the BIOs to the skynet one.

Boost disable is awsome. Also, 1.212v is plenty to max out any games at 1440p.

Have fun my friend :thumbsup:

EDIT: Just curious but what are your ambient temperatures and the water temperature after couple of minutes of load?

 

[guskline]

Great choice mate. Skynet BIOS are solid.

First thing I did with my Zotac GTX 780 Reference and my MSI GTX 780 Twin Fozr Gaming OC is flash the BIOs to the skynet one.

Boost disable is awsome. Also, 1.212v is plenty to max out any games at 1440p.

Have fun my friend :thumbsup:

EDIT: Just curious but what are your ambient temperatures and the water temperature after couple of minutes of load?

Ambient temps I haven't measured. All 4 of my computers are in my "hobby room" in our finished basement. I'll check the temps later. The gpu load temp does not exceed 40C regardless of how long I run it. Of course I have 2 360 rads (XSPC RX360 and EX360 in my loop. The RX360 is mounted to the inside top of my CM HAF932 Adv case and the EX360 is mounted externally and vertically to the rear of the case with the XSPC mounting brackets). I have 6 Corsair SP120 HP fans running at the stepped down speed of @1450rpm.

With a 3930k and 2 670s previously I wanted enough cooling capacity to OC. I figured that between the OC'd 3930k and the 2 670s I was likely dumping up to 660 watts into the loop.

BrightCandle and the WC mod here helped tremendously to educate me on the concept of having sufficient rad space.

Of course KaRLiTos you understand this very well with your rig.

 

[KaRLiToS]

You have a very good cooling system now for sure.

I just wanted to know what your Delta T was to see how good your loop is.

If:
Water = 28'C
Ambient = 25'C
________________
Delta T = 3'C

DELTA T of less than 5'C is considered as a top notch loop (but you need a temperature sensor in the loop to measure that.)

Source:http://www.overclockers.com/guide-deltat-water-cooling/

Let’s Talk About What a “Good” DT is

A CPU loop needs a good DT. Under 10°C is just fine, getting closer to 5°C is very nice and important if you want big overclocks. Getting under 5°C is just overdoing it, unless you’re very extreme, need it for benching or just want a challenge. On an average CPU loop shoot for under 10°C and adjust your overclocks to be fine under the temperatures suggested by the CPU and GPU manufacturers.

A GPU loop used to be fine with a 15° to 20°C DT. If you’re a big GPU overclocker, then shoot for 15°C or lower. The Voltage Regulator Modules (VRM) on these new cards can be affected by temps. If you’ve got a GTX 280 like me, don’t worry about it, it’s the 5970 and the GTX480 and other really hot cards that can have this issue. A lower DT might be needed for a GPU loop if you’re a big overclocker – thats up to you as you design your setup.

 

[guskline]

I'll have to get a Water temp sensor. KaRLiToS where in your loop did you place your water temp sensor?

 

[rtsurfer]

I now have flashed the BIOS to skyn3t rev 4 and WOW. Base clock is 1111Mhz and boost is disabled. I run core at @1270 and memory at +350 on Precision. The temps are solid 29C idle 39-40C Max.

3D Firestrike is @10800

Congratulations.

Also try pushing the card further.
You should be able to hit 1400 mhz or higher.

 

[KaRLiToS]

I'll have to get a Water temp sensor. KaRLiToS where in your loop did you place your water temp sensor?

You can place them anywhere in your loop if you want.

They look like this: You can whether plug it in the motherboard or in any LCD monitor that has a 2 pin sensor connector. (such as the XSPC ones for around 7$ )

Also, it's better to place it where you can put a T- Line . Or you can also place it on a component that has multi-outputs like some reservoir or rads.

In my case, I have two sensors. One before my Feser 480mm Rad and one after the Mora 1080mm Radiator. It goes like this

1. Reservoir
2. 2 x MCP 655 Pumps
3. Feser 240mm Rad
4. Quad R9 290x
5. FIRST TEMPERATURE SENSOR [24'C]
6. Feser 480 mm Rad
7. 1 x MCP 655 Pump
8. Mo-Ra 3 1080mm Radiator
9. SECOND TEMPERATURE SENSOR [24'C]
10. Feser 360 mm Rad
11. Mobo block
12. CPU block
13. Mobo Block
14. Back to Reservoir

They are both at 24'C so it clearly demonstrates that the water is the same accross the whole loop because it moves so fast. As shown in my loop, after two huge radiators of cooling, the water is still the same temperature. So placing the Temperature sensor anywhere in the loop will indicates accurate reading of the water.