will_s Posted April 14, 2021 Share Posted April 14, 2021 Have flow from Res (XD5) to Rad to GPU and from GPU to CPU ( XC7 I think )to Rad and back to res Res ( 2 rads ) But I cant recall if for the CPU water block they have to go in a particular order ...so if the logo facing down does the input go to the right or left hole? Link to comment Share on other sites More sharing options...
Aalb75 Posted April 14, 2021 Share Posted April 14, 2021 If the logo is facing down, the inlet is on the right. Link to comment Share on other sites More sharing options...
c-attack Posted April 14, 2021 Share Posted April 14, 2021 The “triangle” port is the inlet and the flow shaped through the jet plate opening there. The default position is on the right, but the block can be opened up and internal assembly spun around to put the port on the left while still keeping the logo and wire at the bottom. Link to comment Share on other sites More sharing options...
Gusd2 Posted April 18, 2021 Share Posted April 18, 2021 Interesting, I have been running the left as inlet and right as outlet, because it seemed like a better flow path for my particular config. Any particular issues that would arise from this setup? My current flow config for reference: - Pump / resevoir to GPU 3090 - 3090 to 280mm rad - 280mm rad to left CPU block (i9-9900k) - Right CPU block to 360 rad - 360 rad back to pump / reservoir Thanks! Link to comment Share on other sites More sharing options...
LeDoyen Posted April 18, 2021 Share Posted April 18, 2021 in practice there's a very small performance hit when running reverse flow but it's so small it doesn't really matter, maybe a couple of °C at worst. Link to comment Share on other sites More sharing options...
c-attack Posted April 18, 2021 Share Posted April 18, 2021 If you look at the CPU block construction, the designated inlet port delivers fluid to the jet plate (rectangle with the slit through the middle). This forces the water to spray onto the cooling fins in a more uniform manner. The liquid is then pushed out the sides of the channels and is washed around the exterior before leaving through the outlet port. When you run this in reverse the liquid goes into the cooling fins from both ends, but then must be pushed through the jet plate to exit the cooling fins and in the process is not so helpfully sprayed the other direction. That fractional delay is what can cause higher CPU temperatures as the liquid is in contact with the cooling fins longer than designed. I have not run a XC7/9 in reverse so I don't know how much it costs you. Some CPU blocks have a specific design making one port the inlet and the other the outlet. I recommend you follow that for CPU blocks. GPU blocks typically have a slightly different design making the flow direction less critical. Link to comment Share on other sites More sharing options...
Gusd2 Posted April 18, 2021 Share Posted April 18, 2021 I'm going to be doing some maintenance soon, so good time to rotate the block and ensure I'm going in and out the right ports. Thanks for all the feedback. Link to comment Share on other sites More sharing options...
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