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  Topic Review (Newest First)
11-08-2019 03:27 PM
charliehorse55
Quote: Originally Posted by mfdoom7 View Post
2 pump in series ? or my ddc310 will be good enough

Just a single DDC 3.1 should be enough. Radiators have very low restriction due to their size and relatively large internal openings (compared to a CPU block, for instance)
11-08-2019 02:30 PM
mfdoom7
Quote: Originally Posted by charliehorse55 View Post
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)
2 pump in series ? or my ddc310 will be good enough
11-07-2019 01:52 PM
charliehorse55
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)
11-07-2019 12:12 PM
StAndrew
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.
11-07-2019 11:42 AM
ThrashZone 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.
11-07-2019 11:26 AM
TeslaHUN
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.
11-07-2019 11:24 AM
mfdoom7
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 ?
11-07-2019 11:10 AM
mfdoom7
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
11-07-2019 11:08 AM
charliehorse55 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.
11-07-2019 10:07 AM
StAndrew 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.
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