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post #1 of 12 (permalink) Old 11-07-2019, 09:32 AM - Thread Starter
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how much radiator space.

Currently i have alpha cool st30 280mm and 360mm and 9900k + 1080ti both oc. i have spare 240mm radiator EKWB coolstream SE 240 i was wondering if i gain more cooling power. i run my fans @ 700 rpm 3x silent wings 3 and 2x140mm alphacool stock fans. do i gain more than 3c cooling or less ? gpu temp is not problem its the cpu.

My System
(19 items)
CPU
i7 8700k
Motherboard
Asrock Extreme4
GPU
GeForce® GTX 1080 Ti Gaming OC 11G
RAM
16gb 2400 cl16 Crucial Ballistix
Hard Drive
WD wd10ezex
Hard Drive
WD wd10ezrz
Hard Drive
Samsung evo 840 250Gb
Hard Drive
Samsung evo 850 500Gb
Hard Drive
Samsung evo 850 500Gb
Power Supply
Seasonic G Series G-650
Cooling
Alphacool eisbaer 280
Case
Corsair Carbide Air 540
Operating System
Windows 8.1
Monitor
DELL U2515H
Keyboard
Compaq GYUR86SK PS/2 Multimedia Keyboard SK-2860 with 8 extra buttons
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post #2 of 12 (permalink) Old 11-07-2019, 09:50 AM
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Hi,
Probably not but won't really hurt anything either
Little more work for the pump but se240 isn't restrictive either.

CPU
i9-9940x With Optimus Foundation copper-plexi and Heatkiller VRM Plexi-Copper water block
Motherboard
ASUS x299 Rampage VI Apex
GPU
Titan Xp with copper Water Block
RAM
Trident Z 3600C16 4x8gb's b-die default timings 16-16-16-36
Hard Drive
Samsung 970 Evo Plus 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Optical Drive
LG Blu-Ray WH16NS40
Power Supply
evga 1200-P2
Cooling
2-280GTX Black Ice Nemesis rads with D5 pump-res combo and D5 top before and after rads.
Case
corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 pro & 10 pro Win-7 Primary os.
Monitor
ASUS VG248QE 24" 144Hz
Keyboard
Logitech G910 Orion spectrum
Mouse
Redragon Perdition
Audio
Built in realtek and Insignia 2.0 soundbar HSB318
Other
5.0/https://valid.x86.fr/ez2ifr
CPU
i7-5930k with Heatkiller IV Pro Plexi-Copper and koolance vrm water blocks
Motherboard
X99 Sabertooth
GPU
EVGA 1080ti FTW3 with Water block
RAM
Trident-Z 3200C14 4x8gb's b-die default timings 14-14-14-34
Hard Drive
Samsung 970 Evo 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Power Supply
EVGA 1000-P2
Cooling
2-240 GTX Black Ice Nemesis rads/ D5 pump-res combo and D5 top before and after rads.
Case
Corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 and 10 pro Win-7 Primary os.
Monitor
AOC G2460PG 24"G-Sync 144Hz
Mouse
Red Dragon Perdition
Audio
Built in realtek and Insignia 2.0 soundbar HSB318
Hard Drive
eLeaf MELO-3 4ml
Power Supply
SE US18650VTC6 3120mAh 30A 3.6V 18650 Li-ion Battery - GREENx4
Case
ANGIS Legion MOD 200w Geek Vape
Operating System
VapeWild RazzleBerry 50-50-0mg nic
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post #3 of 12 (permalink) Old 11-07-2019, 10:07 AM
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Cooling from more radiators gives diminishing returns. Depending on how your case is setup, using exhaust air from one radiator to cool another (ie if one radiator is intake and the other as exhaust, you lose efficiency.

My recommendation is, if you have the extra radiator, put it in on your next water change. If you don't, don't spend the money unless its burning a hole in your pocket. The extra radiator will help you run fans at a lower speed.

My setup is a 360, 280, 240, and 120; literally everywhere that can mount a radiator has a radiator. All radiators drawing air in so they all are running at close to maximum efficiency and a 250mm fan mounted on the side panel runs as exhaust. I can run my fans around 800RPM's so that only my pump noise is readily noticeable and cool an 8700k and 1080ti rather well. CPU reaches 50s - 60s when gaming and the GPU rarely goes over 32C; generally not much more than 7-10* over ambient.

Asus Prime Z370, Intel 8700k @5.0Ghz, Nvidia GTX 1080 Ti, 16GB @3400 CL14, Watercooling: x2 MCP355 pumps, x1 280 on front of case, x1 360 on top of case, x1 140 on back of case, x1 240 on bottom of case
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post #4 of 12 (permalink) Old 11-07-2019, 11:08 AM
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Doing a rough calculation in my head, I don't think you'd get a 3C drop. Perhaps 0-1.5C. The limiting factor here isn't as much the water temperature, but the contact between the CPU die and the waterblock. Check out lapping, or potentially even going direct die. Those techniques can often give 5C+ drops.
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post #5 of 12 (permalink) Old 11-07-2019, 11:10 AM - Thread Starter
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Quote: Originally Posted by StAndrew View Post
Cooling from more radiators gives diminishing returns. Depending on how your case is setup, using exhaust air from one radiator to cool another (ie if one radiator is intake and the other as exhaust, you lose efficiency.

My recommendation is, if you have the extra radiator, put it in on your next water change. If you don't, don't spend the money unless its burning a hole in your pocket. The extra radiator will help you run fans at a lower speed.

My setup is a 360, 280, 240, and 120; literally everywhere that can mount a radiator has a radiator. All radiators drawing air in so they all are running at close to maximum efficiency and a 250mm fan mounted on the side panel runs as exhaust. I can run my fans around 800RPM's so that only my pump noise is readily noticeable and cool an 8700k and 1080ti rather well. CPU reaches 50s - 60s when gaming and the GPU rarely goes over 32C; generally not much more than 7-10* over ambient.
all radiator fans take air from outside. so its good as it gets

My System
(19 items)
CPU
i7 8700k
Motherboard
Asrock Extreme4
GPU
GeForce® GTX 1080 Ti Gaming OC 11G
RAM
16gb 2400 cl16 Crucial Ballistix
Hard Drive
WD wd10ezex
Hard Drive
WD wd10ezrz
Hard Drive
Samsung evo 840 250Gb
Hard Drive
Samsung evo 850 500Gb
Hard Drive
Samsung evo 850 500Gb
Power Supply
Seasonic G Series G-650
Cooling
Alphacool eisbaer 280
Case
Corsair Carbide Air 540
Operating System
Windows 8.1
Monitor
DELL U2515H
Keyboard
Compaq GYUR86SK PS/2 Multimedia Keyboard SK-2860 with 8 extra buttons
Mouse
Logitech G402
Mouse
a4tech gaming x7
Audio
logitech x-530 + JBL GT series gt5-1204br and Pioneer GM-D9601
Other
bitfenix recon
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post #6 of 12 (permalink) Old 11-07-2019, 11:24 AM - Thread Starter
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Quote: Originally Posted by charliehorse55 View Post
Doing a rough calculation in my head, I don't think you'd get a 3C drop. Perhaps 0-1.5C. The limiting factor here isn't as much the water temperature, but the contact between the CPU die and the waterblock. Check out lapping, or potentially even going direct die. Those techniques can often give 5C+ drops.
but it does make water temp better ?

My System
(19 items)
CPU
i7 8700k
Motherboard
Asrock Extreme4
GPU
GeForce® GTX 1080 Ti Gaming OC 11G
RAM
16gb 2400 cl16 Crucial Ballistix
Hard Drive
WD wd10ezex
Hard Drive
WD wd10ezrz
Hard Drive
Samsung evo 840 250Gb
Hard Drive
Samsung evo 850 500Gb
Hard Drive
Samsung evo 850 500Gb
Power Supply
Seasonic G Series G-650
Cooling
Alphacool eisbaer 280
Case
Corsair Carbide Air 540
Operating System
Windows 8.1
Monitor
DELL U2515H
Keyboard
Compaq GYUR86SK PS/2 Multimedia Keyboard SK-2860 with 8 extra buttons
Mouse
Logitech G402
Mouse
a4tech gaming x7
Audio
logitech x-530 + JBL GT series gt5-1204br and Pioneer GM-D9601
Other
bitfenix recon
▲ hide details ▲
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post #7 of 12 (permalink) Old 11-07-2019, 11:26 AM
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Quote: Originally Posted by charliehorse55 View Post
Doing a rough calculation in my head, I don't think you'd get a 3C drop. Perhaps 0-1.5C. The limiting factor here isn't as much the water temperature, but the contact between the CPU die and the waterblock. Check out lapping, or potentially even going direct die. Those techniques can often give 5C+ drops.
According to this post : https://www.overclock.net/forum/25429247-post2364.html
Radiator surface area is never enough. He will win more than 0-1,5C for sure.
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post #8 of 12 (permalink) Old 11-07-2019, 11:42 AM
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Hi,
Water temp will likely average out the same.
Temp spikes might be a hair less with more rad space but about it on low fan speeds.

Higher rpm speeds might show more advantage.

CPU
i9-9940x With Optimus Foundation copper-plexi and Heatkiller VRM Plexi-Copper water block
Motherboard
ASUS x299 Rampage VI Apex
GPU
Titan Xp with copper Water Block
RAM
Trident Z 3600C16 4x8gb's b-die default timings 16-16-16-36
Hard Drive
Samsung 970 Evo Plus 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Optical Drive
LG Blu-Ray WH16NS40
Power Supply
evga 1200-P2
Cooling
2-280GTX Black Ice Nemesis rads with D5 pump-res combo and D5 top before and after rads.
Case
corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 pro & 10 pro Win-7 Primary os.
Monitor
ASUS VG248QE 24" 144Hz
Keyboard
Logitech G910 Orion spectrum
Mouse
Redragon Perdition
Audio
Built in realtek and Insignia 2.0 soundbar HSB318
Other
5.0/https://valid.x86.fr/ez2ifr
CPU
i7-5930k with Heatkiller IV Pro Plexi-Copper and koolance vrm water blocks
Motherboard
X99 Sabertooth
GPU
EVGA 1080ti FTW3 with Water block
RAM
Trident-Z 3200C14 4x8gb's b-die default timings 14-14-14-34
Hard Drive
Samsung 970 Evo 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Power Supply
EVGA 1000-P2
Cooling
2-240 GTX Black Ice Nemesis rads/ D5 pump-res combo and D5 top before and after rads.
Case
Corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 and 10 pro Win-7 Primary os.
Monitor
AOC G2460PG 24"G-Sync 144Hz
Mouse
Red Dragon Perdition
Audio
Built in realtek and Insignia 2.0 soundbar HSB318
Hard Drive
eLeaf MELO-3 4ml
Power Supply
SE US18650VTC6 3120mAh 30A 3.6V 18650 Li-ion Battery - GREENx4
Case
ANGIS Legion MOD 200w Geek Vape
Operating System
VapeWild RazzleBerry 50-50-0mg nic
▲ hide details ▲
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post #9 of 12 (permalink) Old 11-07-2019, 12:12 PM
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Quote: Originally Posted by TeslaHUN View Post
According to this post : https://www.overclock.net/forum/25429247-post2364.html
Radiator surface area is never enough. He will win more than 0-1,5C for sure.
Yeah, there is a point where you have enough radiators that the water temp normalizes with ambient air temps before circulating back to your block and your CPU temps are limited by the waterblock efficiency only.

OP, do your temps scale well with fan speeds? If so, another radiator would help. If not, another radiator will allow lower fan speeds but won't give much more in terms of overall performance.

Asus Prime Z370, Intel 8700k @5.0Ghz, Nvidia GTX 1080 Ti, 16GB @3400 CL14, Watercooling: x2 MCP355 pumps, x1 280 on front of case, x1 360 on top of case, x1 140 on back of case, x1 240 on bottom of case
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post #10 of 12 (permalink) Old 11-07-2019, 01:52 PM
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Quote: Originally Posted by mfdoom7 View Post
but it does make water temp better ?
Yes. With your rig, I would estimate the water-air delta to be around 8C with the 700rpm fans. Adding a 240 rad would increase the total radiator surface area by 30%, lowering your water temperatures to 8/1.3 = ~6C. So I would expect a 2C drop. Assuming all radiators are intaking cold air from outside the case.

(I did the math this time)
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