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XSPC Rasa/750/RX360 kit performance

post #1 of 6
Thread Starter 
So as I've had it a week now, I have had some time to judge the performance of my XSPC kit. Let me start off by saying I am very impressed by the XSPC components when you consider how inexpensive they are. The kit is very well thought out, easy to install, and performs very well. I would not hesitate to recommend it to anybody looking to "get their feet wet" with water cooling.

I have a 965BE running at 4.2GHz stable with 21C ambient temps. The best my old air cooler (CNPS10X) could manage was just over 4GHz.

So naturally the first thing I do after figuring out how high I could take it was to try to enhance the already great performance of this kit. Below are my conclusions. By all means, these were not very scientific tests, just more or less getting a rough estimate of how I could improve the kit.
Idle temps were taken with CnQ off sitting at the desktop with nothing running. Load were taken with 10 mins of P95 blend. Always at 4.2GHz and 1.56v core. The system is filled with distilled water with a silver kill coil.

The first step was (based on recommendations) to lap the CPU and waterblock.

http://www.overclock.net/amd-cpus/89...ifference.html
Conclusion:
Lapping = NO DIFFERENCE - IMO lapping with this kit/processor is a waste of time and money. (note I was using "the best" shin-itsu TIM both before and after lapping)

The second step was to use some high-speed fans on the radiator. Keep in mind the RX360 is designed for low-speed fans. The included fans in the kit do seem to move plenty of air in pull at full speed. Adding three magma fans as pushers only dropped my load temps by ~2 degrees C. Measurable and repeatable, but worthwhile? Just for ****s and grins I built a shroud out of cardboard and used a 120v high-speed blower fan to blow TONS of air through the rad. I dropped temps another 2 degrees under load. That thing has to be moving 2000CFM; way more than any PC fans could ever manage. Not to mention you could not be in the same room with the thing for very long without a steady ringing in your ears.
Conclusion:
Increased rad airflow = ABSOLUTELY MINIMAL DIFFERENCE - Might be worth the money and noise if you cared. The rad was obviously designed for low-speed fans.

The third step was to try a different pump. I have a lightly used MCP350 pump and used the stock XSPC res; bypassing the pump by putting the inlet hose in the fill hole for the res. This netted exactly the same performance as with the XSPC 750 pump, with temperatures at idle and load being exactly the same.
Conclusion:
Pump Change = NO DIFFERENCE. There are better pumps on the market though, and perhaps those would improve water flow enough to be worth the cost.

The final step was to examine the effect of different ambient temperatures on the system. This almost goes without saying, but this is where I was actually able to improve performance. I put the entire pc "outside" by building a foam insulation enclosure around a window. This was in leau of building a chiller or using a freezer because... well it's really cold outside. With the radiator sitting outside and the computer at a barely different temp "inside", condensation was a non-issue. With -10 degree C air I had around +10 degree core temps at idle- not that that low of a temperature is accurate from the on-die thermistor, but whatever. It hit a maximum of 22C at full load. Awesome. I should note that temps seemed to fluctuate around quite a bit... like 1-2 degrees in either direction. I'm not sure what exactly causes this, but obviously a result of the cold.

I was able to hit just over 4.4ghz stable with 1.61v. Any more clock and it would crash, any more voltage and it would crash under a few seconds of P95. I was also able to get a 3.7ghz validation without even trying.

Final Conclusion:
Chilled water = SUBSTANTIAL DIFFERENCE. The most obvious and perhaps the only to SUBSTANTIALLY improve the performance of this kit (on my system) was to chill the water.
    
CPUMotherboardGraphicsRAM
965BE @ 4.24Ghz (223x19) 1.56v Crosshair IV Formula MSI GTX465 unlocked to 470 G.skill 8gb DDR3 1600mhz cas 9 @ 7-8-7-15 
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Hard DriveOptical DriveOSMonitor
Intel SSD X-25M 80gb Hitachi 7200RPM 500GB Win7 home premium 64 bit ASUS 21.5" LED 2ms GTG 
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post #2 of 6
You need to run large FFTs and for longer than 10 minutes (at least an hour) to get better readings. Blend won't raise the CPU temp as high as it would go.
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SpinpontF3 1TB, WD 250, and WD320 Lite-On DT Waterblocks DT5Noz Waterblock Swiftech Komodo 6900-1 Waterblock 
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post #3 of 6
i want to see if someones got an apogee xt to swap out the rasa and see if theres a differents
post #4 of 6
Thread Starter 
Quote:
Originally Posted by Skripka View Post
You need to run large FFTs and for longer than 10 minutes (at least an hour) to get better readings. Blend won't raise the CPU temp as high as it would go.
Ah. If I care to repeat the cooler or pump tests, I'll do it longer. For a very general view of performance modifications I didn't feel you needed a super long test time. Normally I get a spike in temp around the 30 second mark (I assume this is when the water temp in the system has all gone up in temp slightly). Then another spike a few mins which rises over 1-2 min and then it stabilizes. This is the trend I saw, so I decided that length of time was sufficient for my use. I used P95 blend because (as I understand it) it's a closer simulation to what I mostly do on the system: gaming. Again I should make it clear that these tests were geared towards MY system , and only shared because I felt it might help some others out. In the end the only thing that has me puzzled is trying to understand why some people put high-speed fans on the RX360 rad.
    
CPUMotherboardGraphicsRAM
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Hard DriveOptical DriveOSMonitor
Intel SSD X-25M 80gb Hitachi 7200RPM 500GB Win7 home premium 64 bit ASUS 21.5" LED 2ms GTG 
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by valtopps View Post
i want to see if someones got an apogee xt to swap out the rasa and see if theres a differents
If someone sent me parts like a rad, I would be more than happy to do a full and complete comparison. I've just been tinkering with what I have sitting around. The problem for some of this is I have an AMD-based system, which is going to run a lot cooler than say, an overclocked Core i7. The hotter system would tend to show the differences much better.
    
CPUMotherboardGraphicsRAM
965BE @ 4.24Ghz (223x19) 1.56v Crosshair IV Formula MSI GTX465 unlocked to 470 G.skill 8gb DDR3 1600mhz cas 9 @ 7-8-7-15 
Hard DriveOptical DriveOSMonitor
Intel SSD X-25M 80gb Hitachi 7200RPM 500GB Win7 home premium 64 bit ASUS 21.5" LED 2ms GTG 
KeyboardPowerCaseMouse
Cheapo Antec Truepower New 750w None Logitech Performance MX (awesome) 
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CPUMotherboardGraphicsRAM
965BE @ 4.24Ghz (223x19) 1.56v Crosshair IV Formula MSI GTX465 unlocked to 470 G.skill 8gb DDR3 1600mhz cas 9 @ 7-8-7-15 
Hard DriveOptical DriveOSMonitor
Intel SSD X-25M 80gb Hitachi 7200RPM 500GB Win7 home premium 64 bit ASUS 21.5" LED 2ms GTG 
KeyboardPowerCaseMouse
Cheapo Antec Truepower New 750w None Logitech Performance MX (awesome) 
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post #6 of 6
you're not going to see much difference with such a basic pump, rad and block. Swap them out for all high end and you will see a difference. Probably only a few degrees, but that's something.
 
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Project Atlantis
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i7 3960X w/ EK Supreme HF  Asus Rampage IV Extreme w/ EK full cover Tri SLi EVGA GTX TITAN SC w/ EK full cover & Ba... 64 GB Dominator w/ MIPS Ram Cooler 
Hard DriveHard DriveCoolingCooling
1TB Samsung EVO 850 2x 2TB Western Digital Caviar Black 1x Hardware Labs Black Ice GTX 560  Bitspower Pump Upgrade Kit 
CoolingCoolingCoolingCooling
2x Hardware Labs Black Ice GTX 280 Hardware Labs Black Ice GTX 480 Dual Uber MCP655 Noiseblocker PK-3  
CoolingCoolingCoolingOS
Bitspower Compression Fittings Lamptron FC-8 Noiseblocker PL-2 Windows 7 Ultimate 64bit 
MonitorKeyboardPowerCase
Asus PB287Q 4K Steelseries 7G Custum wired EVGA NEX 1500 Caselabs SMA8 
MouseMouse Pad
Rat 7 Razer Goliathus XL 
CPUMotherboardGraphicsRAM
i7 920 c0 @ 4.2 Ghz w/ 1.4v max 4.6ghz @1.55v w... Asus P6T6 WS Revolution w/ koolance nb/sb+mosfe... EVGA GTX 480 x3 w/ Koolance Vid-NX480 12gb Corsair Dominator 1600mhz w/ MIPS Ramcooler 6 
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