Originally Posted by toolmaker03
Now, the flow a pump can push through a single block is not the same as it can push through multiple blocks either in series or parallel.
If your pump can only push under 4lpm through a single block, it's clearly not an open high flow design or something is wrong with it. That would indicate well over 5 times the restriction of a modern EK gpu or Gpu block.
if you do not mind, I would like to see a pic of your flow meter and the flow rate on your loop, if you can do that for me, I would appreciate it?
I have never seen a EK CPU water block, or a EK full cover GPU block, that could run at a flow rate of 4.6LPM so this will be a good learning experience for me.
thanks in advance for your time.
I have 2 290xs in parallel with EK water blocks and a bunch of rads, as well as flowmeters on EACH block on the outlet, and then a ball valve after each flowmeter before the res.I'm able to adjust the flow through each gpu individually, closing or limiting one gpu forces the water through the other.
My loop order is
reservoir > mcp655b > koolance pmp500 > rad > rad > rad > rad > rad> gpu 1, with parallel tube straigt down to gpu 2, then each gpu has it's own seperate out line. Attached in this line is a 90* elbow, followed by a flow meter, folloewd by 6" tube, followed by ball valve and res.
These are both acetal / nickel blocks. With just the mcp655 running at setting 4, my flow is as follow:
total flow: 2.4lpm, due to the parallel nature of the block setup
If i close the valve on EITHER of the GPU's, the flow becomes 2.4LPM, sometimes bouncing down to 2.1LPM on my koolance flowmeter display adapters.
Temp wise, under load, both cards are in the high 40s. This is 24/7 use daily and is silent with just the D5 running, a combined flow of 2.4LPM total or 1.2LPM individually through the blocks.But when performance is needed, i turn on the PMP500 to 50% speed, which is 3400rpm - temps IMMEDIATELY drop 4-5* celsius
, and the flow rate spikes to 2.1, and 1.8
(as adjusted to by the valves), equaling a total of 3.9liters per minute,
and this is repeated again by closing either of the ball valves on one of the gpus it forces the other one to go to 3.9LPM flow rate. So the blocks are pretty high flowing i'd say..
If I put the PMP500 to 100% pump speed, the flow rate becomes 3.1 and 2.7LPM
respectively, which is effectively 5.8 liters per minute total flow in parallel
I dialed down the flow in GPU 1 to reduce it to 2.9LPM
, the flow rate on the other increases to 2.9LPM, allowing 5.4 liters per minute
PEAK in parallel flow
and by completely closing the gpu 2 valve
all flow is forced through gpu 1, which becomes essentially a serial loop by definition, the flow rate through the single EK full cover water block
becomes a pretty high 5.1 liters per minute,
a loss of 0.3LPM in flow by forcing the water through just one of the blocks.
These numbers correlate with the readings I'm getting from the MPS400 at the bottom of the res about 6 inches before pump inlet, and the FM-16 U shaped koolance flow meter after the pump in the pedestal.