macmall
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I just got a new Comp, 4970k 2x 780 Ti Kingpins 2400mhz Domo's EVGA Z97 Class 1200 Watt Plat PS So the setup has been stable, the one great thing I can say about it. I can't seem to get a stable OC on the CPU and my temps are very low max 60c on stock but that's for another thread, so here's the issue: HEAT! I can't seem to keep this top SLI card from baking.....So both cards are OC'd out the gate @ 1189 core and I keep getting throttled on the top card, it will go all the way up to 86-90c on stock clocks with 100% fan with throttling. The bottom card will sit at 69-75c.....I noticed both cards have different Voltages, On the top card its 1.162 and on the bottom its 1.137 at the same clocks. I am getting a new case tomorrow though, a Cooler Master HAF X, I hope the new fans help. ATM I have a new 760t and its airflow is craptastic.....lol I have the cards in slot 1 and slot 4. Would getting a blower reference cooler help? I would have to use my step up and get the Titan. Or should I send the top card in to be RMA'd? or are they both fine and its just my setup? Really don't care about Oc'ing cause the setup is fast as hell as is, I just don't want to have my cards getting throttled...I know the top card is supposed to be hotter but 15 degrees hotter? almost 90c when running some benchmarks with 100% fan...Can I lower the Voltage on the top card somehow down to 1.137?
post edited by macmall - 2014/08/01 16:32:57
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void_ptr
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Re: So I just bought....
2014/08/01 16:42:10
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Okay, few things here.
First you may want to swap your cards and test if they perform better that way. Generally, you put your "best" card (i.e. lowest voltage at the same clock rate) in the worst conditions (i.e. upper slot), and this evens out the difference a bit. At least, worth the try.
Second sounds like you already have space between the cards - the bigger the gap, the better, even though to my experience more than 1-2 slots in between don't give additional benefits.
Finally I have experience running 4 Titan Blacks. As long as there is a gap between them, they are fine. As soon as you put them side by side, top ones reaches 90 degrees at 100% fan speed, and starts throttling. Needless to say, with 4 GPUs, 3 top ones performed quite terribly. Bottom one was actually not as bad.
The ultimate solution is water cooling. I replaced reference air coolers with waterblocks and assembled a loop, and now that's just heaven and earth.
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macmall
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Re: So I just bought....
2014/08/01 16:54:33
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Sweet, thank you Void for the response!
I'll try the swap later tonight and see if that helps, the new case comes tomorrow too so I'll just test it all tomorrow when I have all the guts out anyways.
I have a question, when you're running just two(if you have) Titan's what's your avg load temp on that top card before you switched to water? Were you somewhere like 70-80c tops? or hotter? With the blower....what I mean is does the blower help more then an ACX cooling? Cause that seems to be my plan B, to trade in these two cards and get two Titan Blacks with stock blower coolers if I can't cool this top card down.
I wish I could just put my whole system on a loop but I've never done it before and to tell you the truth it would be a hassle for me having to make sure nothing leaks and stuff, I just don't have the time or patience ATM, though I'm sure one day I'll take a chance and roll the dice lol.
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Sajin
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Re: So I just bought....
2014/08/01 17:01:27
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Blower style coolers will help with temps for sure. If I were you I would have went with two blower style coolers from the very beginning.
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void_ptr
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Re: So I just bought....
2014/08/01 17:04:32
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☄ Helpfulby macmall 2014/08/01 17:09:37
To my experience those blower-style reference coolers don't actually help with side-by-side installation at all. The thing is, air intake is on the card's side, where the fan is (and not from the back as some people seem to think). Side-by-side, that intake path is pretty much blocked.
With 2 cards *with* a gap between them (on air), I was getting around 85-86 degrees on the top one at maybe 50-60% fan speed, which was bearable. When I got the 3rd card, two of them had to be placed side-by-side with no gap at all, and that's when things turned ugly with the top card basically not being able to maintain stock clock rates.
That was my first water cooled build, and I went ahead and put all 4 GPUs under water. That wasn't as bad as I thought actually, but I was planning the whole thing for a month or so. :D
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macmall
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Re: So I just bought....
2014/08/01 17:08:07
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Sajin
Blower style coolers will help with temps for sure. If I were you I would have went with two blower style coolers from the very beginning.
Yeah I know, I really dropped the ball on that one....This is my first SLI setup ever, been building for years but never a multiple GPU systems. I read the day after I got the setup that its better for SLI to run with the Reference blower cooler. I thought the Kingpin with the ACX would be ok and it is for a one card setups, if I didn't have this other card I'm sure I would be getting 78c max with an OC and a lower fan profile. So there is no way to change Voltage settings, on that top card then? Worst part is I can't even return the cards, I have to use the step up program because Newegg is fail.....Yeah they have a no-return\exchange policy on Video Cards.
post edited by macmall - 2014/08/01 17:13:21
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macmall
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Re: So I just bought....
2014/08/01 17:16:50
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I know at 82c is when these cards start to throttle but I can increase that number to 95, what is a safe temp to be under? Is 90c ok? or more like 85-88c? If I run this top card at 90c with 100% fans and the other one at 75c is that a problem and will it cause damage? Void, you said you ran your top card at 85, didn't that make it throttle? or did you set your temp threshold high to allow for that?
post edited by macmall - 2014/08/01 17:19:24
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Sajin
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Re: So I just bought....
2014/08/01 17:17:07
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☄ Helpfulby macmall 2014/08/01 17:18:20
macmall
So there is no way to change Voltage settings, on that top card then?
Lowering the power target inside precision x will help the card run at lower voltages, this will also affect your maximum clock speeds though.
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void_ptr
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Re: So I just bought....
2014/08/01 17:37:50
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☄ Helpfulby macmall 2014/08/01 18:20:24
macmall
I can increase that number to 95, what is a safe temp to be under?
Well, there's a reason that temperature threshold is set at 82 degrees by default... I'd guess having it in 90-95 range will shorten the card's lifetime; whether that's an issue depends on how long you intend to use it. macmall
Void, you said you ran your top card at 85, didn't that make it throttle? or did you set your temp threshold high to allow for that?
I actually saw cards starting lowering clocks a little bit in the 70-75 degrees range, I think, and then at around 80-85 throttling some more and at the same time spinning the fans up quite a bit. So it's all gradual with slow throttling onset and also depends on the fan curve. But yes, at 85 it does throttle by maybe 50-70 MHz or so. I kept my power and temp targets at their defaults. That is with 2 cards. With 3 and 4 cards, things have gotten way out of hand like I described above, and I actually lowered temp target to 70 or so to keep noise manageable. That of course amounted to underclocking, and I sacrificed maybe 20-30% of performance. That's when I decided to put GPUs under water and never looked back. That's why I also said I wasn't too impressed with reference blower coolers, even though I do like them actually and I think they do decent job in 2-way SLI *with a gap* between the cards. And now they sit nicely on a shelf.
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schmorblatz
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Re: So I just bought....
2014/08/01 18:34:37
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I had such a problem with 2x non reference 770, and a case with only one 140mm front fan.
I solved it with a 150mm Thermalright (very silent) mounted on the side door, and blowing to the graphics cards. BUT : with a gap between the cards. I had a try with the cards side by side, with poor result. If you can, you should try gap + door fan.
why make it simple when it can be complicated ???? rig 1 : Asus P9X79-E WS / i7 4930k / 3-way SLI EVGA 780ti / Quadro K2000 / watercooled / 3D Vision Surround / 3 x Samsung 2233RZ + HP ZR22Wrig 2 : Asus P9X79 WS / i7 4930k / 2-way SLI 770 / aircooled / 3D Vision / Samsung 2233RZ + Samsung 2232BW + HP ZR22Wrig 3, 4 5, etc. : uninteresting !
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macmall
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Re: So I just bought....
2014/08/01 19:41:48
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schmorblatz
I had such a problem with 2x non reference 770, and a case with only one 140mm front fan.
I solved it with a 150mm Thermalright (very silent) mounted on the side door, and blowing to the graphics cards. BUT : with a gap between the cards. I had a try with the cards side by side, with poor result. If you can, you should try gap + door fan.
Tomorrow I get a Cooler Master HAF X and it has a side door fan for the GFX cards, can't wait....I really hope this helps, if not I might have to use my step-up or wait until Oct and hope they release the 880's before my step up ends. What I'm using now: Corsair Graphite Series Arctic White 760T
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jlp209
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Re: So I just bought....
2014/08/01 20:36:23
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Macmall, what is your fan setup with your 760t? Do you just run the stock 2 front intake fans and 1 rear exhaust? If so you may get a big benefit by adding 2 exhaust fans on the top of the case. If you've tried already, never mind this suggestion.  You gotta get that heat out of your case. Don't give up / get down on your Ti Kingpins yet, your new HAF X may also do you a lot of good. That side fan option should be utilized. I used to run 2 780 Classifieds and adding 2 side intake fans to my case REALLY helped my temps. However, I got sick of running 5 case fans plus 2 more fans for my cpu cooler, and sold the cards for 2 reference style Ti's. A bit of an expensive mistake but I don't regret it at all. Good luck!
Asus ROG Strix Z390-I / i9 9900K @ 4.8ghz / Noctua NH-U12A / EVGA RTX 3080 Ti FTW3 Ultra / 32 gb G.Skill DDR4 3600 ram / Inland Premium 2TB NVMe SSD / WD 4TB SSD / LG 27GN950 4K 144hz monitor / Silverstone SX1000 PSU / Lian Li TU150 ITX case
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