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Water going around faster = Lower temp?
- Thread starter DaLurker
- Start date
zer0signal667
2[H]4U
- Joined
- Jan 11, 2002
- Messages
- 3,847
DaLurker said:
Yes, in theory it should give you better heat transfer to have faster flow. Have you noticed a difference in temps?
Faster water doesn't always equal better temps. There comes a point, which varies with each setup, of vanishing returns, when the gains made start to level off. This includes the rad, tubing, blocks and pump.
Blocks reach a point where increasing water throughput gives very little returns.
Certain rads can reach a point where increased flow causes internal problems, reducing returns.
Pumps reach a point where they simply add more heat to the water.
For your setup 7v should be fine, unless your some temp freak and want the absolute lowest possible.
Blocks reach a point where increasing water throughput gives very little returns.
Certain rads can reach a point where increased flow causes internal problems, reducing returns.
Pumps reach a point where they simply add more heat to the water.
For your setup 7v should be fine, unless your some temp freak and want the absolute lowest possible.
Oh my god youve opened a huge can of worms there. Basically its not guaranteed to get you better temps with fast water unless the blocks you are using are designed for it.
But as far as what kind of performance you can expect, why do you need to ask? Have not got MBM/speedfan/some kind of temp monitor running? Why don't you just look? Hell even tell us, you might answer someone elses question.
But as far as what kind of performance you can expect, why do you need to ask? Have not got MBM/speedfan/some kind of temp monitor running? Why don't you just look? Hell even tell us, you might answer someone elses question.
DFI Daishi
2[H]4U
- Joined
- Feb 14, 2005
- Messages
- 2,839
tons of factors go into how flow rate affects cooling performance, but i think that the easiest to understand is that for a given heat load, circulating coolant through the block more rapidly achieves a lower delta T across the block with a larger volume of coolant per unit time. if the coolant going through the block does not get as warm before leaving the block, then the processor runs cooler.
Herulach said:
Just as some background, I'm running a Switech MCW-6002a, 77' Bonneill heatercore, dual Vantec Stealth 120mm Fans with shrouds (offset is 1 1/4" inches or so, at 5 volts), a Swiftech MCP-650 Pump, and a Swiftech 5.25" resovoir.
I actually put the pump back to 12v's, and I'm getting 1 degree better temperature (52C vs 53C). So I guess that answers my questions, for a simple loop with a low flow block, the difference from 12v to 7v is almost nil.
Go figure
I always find it an interesting test to run something like the Prime 95 Torture Test for stability with the pump at full speed, and the CPU at the bleeding edge of stability, and then start winding down the pump's speed and watch what happens to the CPU's stability.
For me It always results in CPU temps creeping up by a small amount (1-5C depending on how far you choke the flow), but results in CPU instability even for 1C reported CPU temperature difference.
Repeat the same test with the pump at full speed, and this time raise the room temperature by 5C (using a heater) and the CPU remains stable. Raise the room by 10C, and then the CPU starts to become unstable.
This leads me to the conclusion that I always state, that the reported temperature does not tell the whole story as to what's going on at the core level.
This phenomenon is more apparant with thin based blocks which almost solely rely on the convectional cooling effect of the water close to the CPU to pull heat away, than thick blocks which rely more on conductional cooling effect of the metal to move CPU heat away.
I've personally always been able to achieve better overclocks with thinner convection-dependent blocks than thicker conduction-dependent blocks so long as the flow rate was sufficient.
Just some food for thought.
For me It always results in CPU temps creeping up by a small amount (1-5C depending on how far you choke the flow), but results in CPU instability even for 1C reported CPU temperature difference.
Repeat the same test with the pump at full speed, and this time raise the room temperature by 5C (using a heater) and the CPU remains stable. Raise the room by 10C, and then the CPU starts to become unstable.
This leads me to the conclusion that I always state, that the reported temperature does not tell the whole story as to what's going on at the core level.
This phenomenon is more apparant with thin based blocks which almost solely rely on the convectional cooling effect of the water close to the CPU to pull heat away, than thick blocks which rely more on conductional cooling effect of the metal to move CPU heat away.
I've personally always been able to achieve better overclocks with thinner convection-dependent blocks than thicker conduction-dependent blocks so long as the flow rate was sufficient.
Just some food for thought.