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Great gpu temps, mediocre cpu temps? - Page 2

post #11 of 51
what's your ambient ?,what type of load ~ how long ?,rad placement ?

2600k at 4.6ghz @ 1.32v, maxes out at ~75c, it's a bit high ..do you have SP1/AVX ,HT on?
here is 25K ambient 80F (2x240 XSPC/EK+1x140 HWL) all fans around 1400RPM

Edited by coolhandluke41 - 6/15/11 at 10:37am
    
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post #12 of 51
Quote:
Originally Posted by Behemoth777 View Post
Hmm, I never thought about just running my loop off only the 360. It's an rs360 though, do you think it would handle even a heavily overclocked 2600k and gtx 580 with high speed yate loon fans?
Definitely. I'm running my 1.48v C2D + GTX 460 off just a 240 rad and my CPU temps only hit 75 when running Orthos for hours. The two best ways to increase the efficiency of your loop would be to either remove some rad or add more heat.

This thread sheds light on heat dissipation by wattage. Roughly speaking, every 120x120 bit of rad adds 200W of peak heat dissipation. If your CPU consumes 150-175W, and the gfx card consumes 250-285W (fair estimates but you can double check with the thermaltake psu calculator), then at idle you'd be maxing out a 240 rad, and at load you'd be into 360 rad territory.

At no point will your loop surpass the 600W that the 360 should be able to handle on it's lonesome. Adding more rad, therefore, only serves to diminish the actual potential of that 360 and also makes more work for the pump which could add more heat if the pump is being overworked, but at the very least slowing down coolant flow which will have a definite impact. I switched pumps in my loop recently from one that could pump only 3ft of head to one that could support 3m of head and I couldn't believe the difference in temps that one change lead to.

Remember that the name of the game in reducing temps is not about "cooling", but rather about redirecting heat. You'll miss the forest for the trees wracking your mind on how to add more cooling potential, because the focus should be on removing what keeps heat in the loop. Take a look at the design of the Corsair H-series CPU coolers and you'll see what I mean. It's simple, small, and can cool a quad-core processor with just a single-fan rad precisely because it sucks every last bit of potential out of it.
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post #13 of 51
Quote:
Originally Posted by Petrol View Post
Definitely. I'm running my 1.48v C2D + GTX 460 off just a 240 rad and my CPU temps only hit 75 when running Orthos for hours. The two best ways to increase the efficiency of your loop would be to either remove some rad or add more heat.

This thread sheds light on heat dissipation by wattage. Roughly speaking, every 120x120 bit of rad adds 200W of peak heat dissipation. If your CPU consumes 150-175W, and the gfx card consumes 250-285W (fair estimates but you can double check with the thermaltake psu calculator), then at idle you'd be maxing out a 240 rad, and at load you'd be into 360 rad territory.

At no point will your loop surpass the 600W that the 360 should be able to handle on it's lonesome. Adding more rad, therefore, only serves to diminish the actual potential of that 360 and also makes more work for the pump which could add more heat if the pump is being overworked, but at the very least slowing down coolant flow which will have a definite impact. I switched pumps in my loop recently from one that could pump only 3ft of head to one that could support 3m of head and I couldn't believe the difference in temps that one change lead to.

Remember that the name of the game in reducing temps is not about "cooling", but rather about redirecting heat. You'll miss the forest for the trees wracking your mind on how to add more cooling potential, because the focus should be on removing what keeps heat in the loop. Take a look at the design of the Corsair H-series CPU coolers and you'll see what I mean. It's simple, small, and can cool a quad-core processor with just a single-fan rad precisely because it sucks every last bit of potential out of it.
really ???..wow just ..wow
    
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post #14 of 51
I use a heatkiller v3.0 special edition CPU block - designed for LGA1156 but i use it on my LGA775 rig.

The block is a little too big for the motherboard and it has this tendancy to sit on the capacitors near the socket, obviously causing bad temps. Several reseats tends to fix this but it's a pain in the backside.

I suggest you reseat, if that solves nothing, then i'm going to assume that your CPU block is too restrictive - or, more then likely, the cpu outputs heat so fast it just can't shift it fast enough.

At least, this is what i've come to believe with my own loop. I get great GPU temps (50C load max) where'as my CPU is near Tjunction at 80 degree's. (tis an old CPU, known for extremely high temps)

Quote:
Originally Posted by coolhandluke41 View Post
really ???..wow just ..wow
Yeah, i know what you mean. Care to explain, Petrol?
Edited by Thingamajig - 6/16/11 at 9:31am
post #15 of 51
@Behemoth777, if you want to know if/how you can improve cpu temps you need to measure water temps and ambients, preferably intake ambients.

But about rads....

I have gtx 295 (2 gpus) and core i7 OCed, probably similar heat load as you, and 1x360 rad and 1x280 rad, both with 1600 rpm fans. I have 10 calibrated dallas temp probes to measure intake ambients and water on crystalfonz 633 and record temps every second... During prime load (cpu 160 Watts loaded) with gpus idle (80W at idle), when I had just 1x360 rad (fans 1600rpms), intake ambients 24C, water temp 31.6C, ie 7.6C delta air to water, and cpu load temp was 75C. Adding in the 280 rad, cooled by same 1600rpms fans, dropped water temps to 29.9C, so dropped delta air to water to 4.9C, and dropped cpu temps to 72.5C. In other words, adding a little over 40% more cooling, predictably improved delta air to water by 40%. However, all rads and fans improve is the delta air to water, so for example if I added 2 more similar rads, at best I could shave the 4.9C in half, ie gain couple C more, so after couple large rads, reached diminishing returns. It is true about rad efficiency improving with heat load, but it is small, difficult to measure, and no way anything near negating another rad.

If I removed one rad, all I or you would accomplish is proportionately increasing delta air to water (back up ~40% on mine), or probably 2-3C or so (guessing your delta with gpus at idle, cpu at load is similar to mine), and thus increase water temps by 2-3C or so, which increase cpu temps by 2-3C.

If you know your delta air to water is only 5-6C, for example, which it may well be with gpus at idle and cpu at load, then only options for increase temps are better tim, maybe a degree or 2, better mount as someone else suggested is worth a try, lower your ambients, stronger pump maybe a degree or 2, making sure all rads using external cool air and not inside case air for cooling.

As an aside, my i940 ran 10C hotter than my i950, given exact same settings, exact same system. So you could just have a hot/leaky cpu, with a high delta cpu to water, and may not have much room to improve.
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post #16 of 51
Quote:
Originally Posted by opt33 View Post
@Behemoth777, if you want to know if/how you can improve cpu temps you need to measure water temps and ambients, preferably intake ambients.

But about rads....

I have gtx 295 (2 gpus) and core i7 OCed, probably similar heat load as you, and 1x360 rad and 1x280 rad, both with 1600 rpm fans. I have 10 calibrated dallas temp probes to measure intake ambients and water on crystalfonz 633 and record temps every second... During prime load (cpu 160 Watts loaded) with gpus idle (80W at idle), when I had just 1x360 rad (fans 1600rpms), intake ambients 24C, water temp 31.6C, ie 7.6C delta air to water, and cpu load temp was 75C. Adding in the 280 rad, cooled by same 1600rpms fans, dropped water temps to 29.9C, so dropped delta air to water to 4.9C, and dropped cpu temps to 72.5C. In other words, adding a little over 40% more cooling, predictably improved delta air to water by 40%. However, all rads and fans improve is the delta air to water, so for example if I added 2 more similar rads, at best I could shave the 4.9C in half, ie gain couple C more, so after couple large rads, reached diminishing returns. It is true about rad efficiency improving with heat load, but it is small, difficult to measure, and no way anything near negating another rad.

If I removed one rad, all I or you would accomplish is proportionately increasing delta air to water (back up ~40% on mine), or probably 2-3C or so (guessing your delta with gpus at idle, cpu at load is similar to mine), and thus increase water temps by 2-3C or so, which increase cpu temps by 2-3C.

If you know your delta air to water is only 5-6C, for example, which it may well be with gpus at idle and cpu at load, then only options for increase temps are better tim, maybe a degree or 2, better mount as someone else suggested is worth a try, lower your ambients, stronger pump maybe a degree or 2, making sure all rads using external cool air and not inside case air for cooling.

As an aside, my i940 ran 10C hotter than my i950, given exact same settings, exact same system. So you could just have a hot/leaky cpu, with a high delta cpu to water, and may not have much room to improve.
^^ this deserves a REP ,thank you for contributing
    
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post #17 of 51
Quote:
Originally Posted by JuStIn871 View Post
Idk if this is possible but open the cpu block and check how restrictive it is, and if you
want use a dremel on the insides to increase the space in the block for more waterflow.
If you are serious, that is up their near the top of the list of the worst advice I've seen on a WC forum...
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post #18 of 51
running LinX with 27.5c water I get 51-61-63-58 max on my cores in Realtemp, CPU-Z says 4.5 ghz at ~1.30v

my GTX480 @ 1.21v / 910mhz core gets up to 45c core (32c pcb) with the same 27.5c water if I run Unigine Heaven 2.5

my flow is 120 l/hour, but I've never noticed temperature difference at 70 l/hour

although we don't have exactly the same hardware I think they're quite comparable, and if your blocks have around the same performance as mine (they do AFAIK) I think the conclusion would be your water is around 35c to 37c ...

if your water-ambient delta is normal for your amount of radiators and the fans you use, you are probably out of options unless you can lower your ambient temperature
[my water-ambient delta is 4c to 5c with nine ~800 rpm 140mm YL fans]
Edited by n0n44m - 6/17/11 at 7:57am
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post #19 of 51
I would also advice re-seating the CPU block. Get soem better TIM, perhaps some PK1, make sure to clena the CPU and block thoroughly, apply TIM, and reseat that sucker.

Could it also be because of the size case you're using? The 690II isn't exactly the largest case, makes me think Ambient temps would stay hotter inside that case rather than a larger one.... ?
post #20 of 51
Quote:
Originally Posted by Behemoth777 View Post
Yup, everything is clean.


I'm using high speed yates on my radiator.

I'm using mx-2 tim.

I'm using the EK full cover cpu block.

My loop goes pump/res>gpu>360>cpu>240>pump/res



I was afraid of that, thanks for the input though.



Hmm, I never thought about just running my loop off only the 360. It's an rs360 though, do you think it would handle even a heavily overclocked 2600k and gtx 580 with high speed yate loon fans?

Also, you might want to change up your loop order. Your parts are fine. Instead of having your 360 go to your gpu, go pump/res > CPU > 240 > GPU > Pump/res. You should get much better cooling numbers that way. Having the 240 after your CPU seems almost pointless if it's just going back to the 360.
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