GTX 770 SLI - Temperatures very different during benchmark

[XxKINGxX40]

Hey guys I was running Valley Benchmark, and the temperatures on my 2 770s were really different. Do you guys have any idea why?

 

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Both GPUs are water cooled.

 

Just in case, my water loop is this: Res -> Alphacool D5 Pump -> GTX 770 -> GTX 770 -> Alphacool XT45 140mm Rad -> i5-4690K CPU -> XSPC 360mm rad -> Alphacool UT60 240mm Rad -> Res

 

 

[xox]

The hotter one seems to be running at a higher frequency

 

Maybe you got a better result in the silicon lottery on that one.

[XxKINGxX40]

The hotter one seems to be running at a higher frequency

 

Maybe you got a better result in the silicon lottery on that one.

65Mhz more. But it shouldn't make that much of a difference in temperature.

[Guest Kloaked]

How close together are the cards sitting, and what case do you have?

 

Spoke too soon. That does seem odd. What does HWMonitor say?

[SuperPug]

With a loop like that the card shouldn't get that hot. I'd say theres something wrong with how the Waterblock is mounted.

 

What rpm is your pump running at?

How are you connecting the two GPU blocks serial or paralell?

 

On a sidenote: Usually your CPU should be first thing in the loop to get the cool water and then the GPU's it is also not necessary to put a rad inbetween the components (gpu - rad - cpu) this wont make a difference in temps since the water is flowing so fast.

[Totally-A-Hero]

The real questions is, why did you water cool two 770's? i cri evry tim

[flibberdipper]

One is running faster, and if it's second in the loop, then it's already gonna run warmer since it's getting "used" water from the other 770. Then it's gonna jack that up even more.

[XxKINGxX40]

How close together are the cards sitting, and what case do you have?

 

Spoke too soon. That does seem odd. What does HWMonitor say?

At idle, Both cards at around 25-27° During Valley, same temps.

[XxKINGxX40]

With a loop like that the card shouldn't get that hot. I'd say theres something wrong with how the Waterblock is mounted.

 

What rpm is your pump running at?

How are you connecting the two GPU blocks serial or paralell?

 

On a sidenote: Usually your CPU should be first thing in the loop to get the cool water and then the GPU's it is also not necessary to put a rad inbetween the components (gpu - rad - cpu) this wont make a difference in temps since the water is flowing so fast.

At Idle, step 3: 3300 RPM, load, Step 5: 4800RPM. And Serial.

[SuperPug]

At Idle, step 3: 3300 RPM, load, Step 5: 4800RPM. And Serial.

 

Hmmm... in that case either the card is bad somehow or the block is not mounted correctly (But then the Idle temps should be different too). Cant think of anything else.

[Guest Kloaked]

If someone here who's adept in custom loops doesn't get back to you with a clear answer, you could try tweeting JayzTwoCents and ask him. He's super helpful sometimes if he has the time to spare.

[XxKINGxX40]

If someone here who's adept in custom loops doesn't get back to you with a clear answer, you could try tweeting JayzTwoCents and ask him. He's super helpful sometimes if he has the time to spare.

Jay's a master at custom water loops. Did you see his Skunkworks PC? So awesome.

[Guest Kloaked]

Jay's a master at custom water loops. Did you see his Skunkworks PC? So awesome.

 

Yes.

 

 

 

HHHHHNNNNNNNNNNNNNNGGGG

[JayzTwoCents]

I think I responded to this on twitter, your Thermal Compound on the second card is improper. Remove, and I bet you will see only half the GPU IHS is covered with TIM. It never spread out. 

[XxKINGxX40]

I think I responded to this on twitter, your Thermal Compound on the second card is improper. Remove, and I bet you will see only half the GPU IHS is covered with TIM. It never spread out. 

Yeah that was my tweet.

I did check the thermal compound. All good.

[XxKINGxX40]

I mean the thermal compound is spread out properly. Not that the problem is fixed.

[D2ultima]

I mean the thermal compound is spread out properly. Not that the problem is fixed.

If you broke the contact, what did you repaste with?

[XxKINGxX40]

If you broke the contact, what did you repaste with?

Broke the contact?

[D2ultima]

Broke the contact?

The thermal paste contact. If you opened it and checked that it was spread evenly, you should have repasted it, no?

[XxKINGxX40]

The thermal paste contact. If you opened it and checked that it was spread evenly, you should have repasted it, no?

Yeah I did. I used the thermal paste the EK waterblock comes with. EK-TIM Ectotherm.