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Alphacool GPX Owners Club and Information Thread - Page 10

post #91 of 352
Quote:
Originally Posted by Sky-way View Post

I have a quick question. I know the GPX is a pretty restrictive block, do you think an Alphacool DC-LT would be enough for it and a 240mm rad? I have a Fractal Design Kelvin T12 which uses a DC-LT 2400rpm pump and I just upgraded to an EK Coolstream SE 240mm rad (26mm thick) and I wanted to get the Alphacool Nexxxos GPX GTX 970 M07 water block for my Asus Turbo 970 (which uses the same pcb as the Asus Direct CUII mini 970). I'm just worried that the GPX block and larger rad will be too much for the little DC-LT.

The 2400 rpm model of the DC-LT claims to have only about 0.6 mH2O head pressure which is a bit on the low side (but should be still capable of driving at least some water through the block I believe). Are you using 5.25'' bay res? If you do then you could give it a try with one pump and if that does not quite cut it then you would have an option to add a second one (as 5.25'' bay res has mounting locations for two of these pumps, be sure the get the right O-ring for that bay res mounting if you order a bulk version of the pump). The higher rpm version should have no problems with the block (that is what I am going to use in my upcoming build), however, the high rpm version is also substantially louder than the same pump at lower rpm value. To be clear I have no personal experience with the 2400 rpm version - I only have the high rpm versions of that pump (two of the very first revision, 3600 rpm no rpm wire and one second revision 3400 rpm with an rpm wire) but I assume that the 2400 rpm version would behaving the same as the high rpm version at lower voltage.
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post #92 of 352
"too much restriction" is mostly a myth... IMO. I had a loop with the "restrictive" GPX 970 and a EK Supremacy EVO, run with a D5 pump at 800 rpm, had no flow problems whatsoever.
post #93 of 352
Quote:
Originally Posted by Sky-way View Post

I have a quick question. I know the GPX is a pretty restrictive block, do you think an Alphacool DC-LT would be enough for it and a 240mm rad? I have a Fractal Design Kelvin T12 which uses a DC-LT 2400rpm pump and I just upgraded to an EK Coolstream SE 240mm rad (26mm thick) and I wanted to get the Alphacool Nexxxos GPX GTX 970 M07 water block for my Asus Turbo 970 (which uses the same pcb as the Asus Direct CUII mini 970). I'm just worried that the GPX block and larger rad will be too much for the little DC-LT.

My loop has the DC-LT with a GPX GPU block, Raystorm CPU block, quick disconnects and a 360 rad. With my 270x it ran just fine even with the pump turned down to around 2500rpm. Haven't got round to testing lower speeds with my 390 but it's working fine at full speed.

The only warning is that for filling and bleeding the loop I found turning it to the full 3600rpm pretty handy. My loop would be more restrictive though (quick disconnects add quite a bit of resistance) so you may be okay but know there's a risk you may need to resort to quite a lot of tilting shaking etc...

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post #94 of 352
Quote:
Originally Posted by bichael View Post

My loop has the DC-LT with a GPX GPU block, Raystorm CPU block, quick disconnects and a 360 rad. With my 270x it ran just fine even with the pump turned down to around 2500rpm. Haven't got round to testing lower speeds with my 390 but it's working fine at full speed.

The only warning is that for filling and bleeding the loop I found turning it to the full 3600rpm pretty handy. My loop would be more restrictive though (quick disconnects add quite a bit of resistance) so you may be okay but know there's a risk you may need to resort to quite a lot of tilting shaking etc...

Ok thanks, just what I needed to know. I have the 2400 rpm version so I think it would be even harder to bleed the air. I also have no control of the pump speed, it's a 3 pin cable and I don't have any voltage control. I was debating on using EK's thermosphere or the GPX and I think I might go for the GPX. What are your temps on your 290 with the GPX? I was also thinking about adding another 2400 rpm DC-LT to help with the added restriction.
post #95 of 352
Quote:
Originally Posted by Carniflex View Post

The 2400 rpm model of the DC-LT claims to have only about 0.6 mH2O head pressure which is a bit on the low side (but should be still capable of driving at least some water through the block I believe). Are you using 5.25'' bay res? If you do then you could give it a try with one pump and if that does not quite cut it then you would have an option to add a second one (as 5.25'' bay res has mounting locations for two of these pumps, be sure the get the right O-ring for that bay res mounting if you order a bulk version of the pump). The higher rpm version should have no problems with the block (that is what I am going to use in my upcoming build), however, the high rpm version is also substantially louder than the same pump at lower rpm value. To be clear I have no personal experience with the 2400 rpm version - I only have the high rpm versions of that pump (two of the very first revision, 3600 rpm no rpm wire and one second revision 3400 rpm with an rpm wire) but I assume that the 2400 rpm version would behaving the same as the high rpm version at lower voltage.


I am using an AIO water cooler, the Fractal Design Kelvin T12, which has no reservoir. I've been eyeing a small 40mm bitspower Z tank res, I'll probably be picking it up soon. The 2400 rpm DC-LT is pretty quiet, almost silent. Yesterday I upgraded the stock 120mm rad that came on my T12 with an EK 240mm rad and the pump is working harder and running a little higher rpm than usual (2800). It's definitely louder with the larger rad but the cooling benefit is totally worth the extra noise.
post #96 of 352
Quote:
Originally Posted by Sky-way View Post

Ok thanks, just what I needed to know. I have the 2400 rpm version so I think it would be even harder to bleed the air. I also have no control of the pump speed, it's a 3 pin cable and I don't have any voltage control. I was debating on using EK's thermosphere or the GPX and I think I might go for the GPX. What are your temps on your 290 with the GPX? I was also thinking about adding another 2400 rpm DC-LT to help with the added restriction.

I would definitely recommend the GPX, with the thermosphere you still need to worry about vrm cooling. Temperatures should be good. My 390 gets to around 50oC but that's with a 30oC room (not extensively tested yet). When testing on my 270x previously it was 45oC at 12V and 53oC at 5V. I didn't have the speed wire hooked up then but 5V was definitely a lot less flow than 2500rpm, I was surprised the temps were still okay given the flow seemed so little.

You won't need speed control with the 2400 DC-LT version as it's already quiet. Originally I was using a simple molex voltage adapter but then I got a zalman fanmate 2 for speed control - the speed I settled on was around 2500rpm as it became very quiet at that point with still okay flow - guess they chose 2400 for a reason!

Adding a res would make filling/bleeding easier so probably a good idea. Bleeding my loop is more than fine at 3600, although that's higher speed than you have I also have more restriction with the disconnects, so my guess is you should be okay. I would give it a go before adding another pump but a second 2400 DC-LT would certainly solve it if you did have a problem.

Good luck and enjoy!
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post #97 of 352
Quote:
Originally Posted by hawktulu98 View Post

It will be OK.. I have kelvin S36 with nexxxos on GB 970 and I can easily cool it when pump is on 9V.
Temps for GPU: max 53, CPU (i5 2500k@4400) 56-57

Good to hear, it looks like I'll be ok then. Temps look really good, did you add a reservoir to your loop?
Quote:
Originally Posted by bichael View Post

I would definitely recommend the GPX, with the thermosphere you still need to worry about vrm cooling. Temperatures should be good. My 390 gets to around 50oC but that's with a 30oC room (not extensively tested yet). When testing on my 270x previously it was 45oC at 12V and 53oC at 5V. I didn't have the speed wire hooked up then but 5V was definitely a lot less flow than 2500rpm, I was surprised the temps were still okay given the flow seemed so little.

You won't need speed control with the 2400 DC-LT version as it's already quiet. Originally I was using a simple molex voltage adapter but then I got a zalman fanmate 2 for speed control - the speed I settled on was around 2500rpm as it became very quiet at that point with still okay flow - guess they chose 2400 for a reason!

Adding a res would make filling/bleeding easier so probably a good idea. Bleeding my loop is more than fine at 3600, although that's higher speed than you have I also have more restriction with the disconnects, so my guess is you should be okay. I would give it a go before adding another pump but a second 2400 DC-LT would certainly solve it if you did have a problem.

Good luck and enjoy!

50C is not too shabby, especially with an ambient of 30C! Is that while benchmarking/stress testing, or gaming?


Thanks for the replies and help everyone, I bought the GPX last night. It will be a couple of weeks before I get to try it out, I still need to get tubing, fittings, and a res. Hopefully it will fit, my card is technically not supported but it uses the same pcb as a card that is and it looks like it will work. Only one way to find out!
post #98 of 352
The DC-LT in the Fractal Kelvin ist strong enough for that. You will not have the best flow, but that is not important wink.gif
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post #99 of 352
Quote:
Originally Posted by AT-Eduard View Post

The DC-LT in the Fractal Kelvin ist strong enough for that. You will not have the best flow, but that is not important wink.gif

"Flow is not important" what am I reading?

I wish I could find that article I read a while ago, you do want as close as possible to atleast 1.5 GPM if you want your water to flow properly inside the radiator and not in irregular pattern.
I will keep searching...
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post #100 of 352
I think you missunderstand me. The point is, you do not need a high flow system, so if you have around 30-40L everything is ok. Less than 20L could be a problem, thats true. But the most people are thinking, they need 100L and more and that`s nonsense.

And i have no idea what 1.5 GPM means.
Edited by AT-Eduard - 1/26/16 at 4:10am
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