You might be able to explain some of the behavior if you wanted to get creative by burning a simple incense stick (or some harmless equivalent) and watching the actual airflow pattern. Maybe there are hot pockets or leaks causing an imbalance you're not expecting?Well, I did some testing with different fans in different locations. I can only say that PC cooling is not even close to intuitive. :dunno:
There are spots for two 140mm fans in the front of the 600Q. There's one spot in the back on the bottom for a fan. The best GPU temps are achieved with one fan on the top in front blowing into the case and one in the back (bottom) blowing out. Adding a 2nd front fan so there is both a top and bottom fan in the front blowing into the case in addition to the single lower rear fan blowing out yields higher GPU temps than a single fan front fan blowing in + lower rear fan blowing out. Two fans in the front blowing into the case and none in the back runs the GPU hotter yet. FWIW, SPCR found the same behavior. Specifically that adding a 2nd front fan blowing into the case hurt GPU temps.
Where it starts to get really weird is that there seems to be a sweet spot for the amount of airflow moved out of the case by the lower rear fan. No fan in the rear blowing out = highest temps, but Fan A spinning at say 600RPM gives better GPU temps than a Fan B spinning at 950RPM in the lower rear spot, despite the fact that Fan B moves more air. The grill in the case the fan blows through is pretty open so I don't really see this as an issue of static pressure. I'm waiting on a little more hardware to arrive so I can test this better. Fan B lacks PWM control so I can't currently slow it down to the same RPM as fan A, and fan A is getting the same PWM signal as the CPU fan, so I can't speed it up in isolation. Right now I'm :scratch:
That might be a viable option if I had a clear side panel. Running it with the side open so I could see the smoke would totally change the results.You might be able to explain some of the behavior if you wanted to get creative by burning a simple incense stick (or some harmless equivalent) and watching the actual airflow pattern. Maybe there are hot pockets or leaks causing an imbalance you're not expecting?
The backplate of the video card is just above the bottom of the top fan, so... The top one, no. The bottom one, probably.Don't forget about the PS fan as an exhaust port. Is the placement of the two front fans such that air could go from a front to back pair on not cross the area with the gpu?
I swapped the fans and did a little more testing. Some of the fans seem to have much more focused airflow. When using the fan with the most focused airflow up top in the front blowing in the GPU temps barely seem affected by the speed of the lower exhaust fan (no more than a 1C swing from minimum speed to maximum speed of the lower rear exhaust fan). When using one of the fans with the more diffuse airflow in the front up top blowing in the speed of the lower exhaust fan does seem to matter much more (like 3C swing from min to max speed). I attempt to reproduce the results I observed earlier and was unable. The GPU temps were lowest when the lower rear exhaust fan was spinning the fastest. Slowing it down did not lower GPU temps.To me that indicates that the fan is mainly preventing air from flowing the opposite direction. Try just blocking off that part of the case and see what happens.
Uh... This is one of the best quiet cases for GPU thermals out there per SPCR. It was the best they tested that had optical drive bays, which I need. It's measurably better than the Antec P180 I started with and the GPU doesn't bake the CPU. I'm keeping the GPU under the throttling threshold of 82C while keeping the system virtually inaudible. That was the goal. I'm just doing a final bit of tweaking to find the best fans for each spot to keep it as cool as possible while being virtually inaudible.You need to get reasonable airflow across the GPU subsystem, but that case is making it nearly impossible.
What did you think you were going to get when you drop in and try to tell me I'm doing it all wrong and am using the wrong case for the job? I didn't start a thread looking for blank slate case ideas, but I started one just for you. Here you go.My post was in response to your snark.
Accurate, but totally non helpful. It still doesn't have any 5.25" drive bays to support the optical drives I already have.Everything in it is accurate, including the fact that the FT05 supports an internal optical drive.
And they still won't hold my motherboard, cooler, or the two 5.25" half height optical drives I have. The comment you're highlighting has an implied "that holds my gear" attached to it, but you're trying to treat it as an absolute statement when it's clearly made in the context of other posts and the thread as a whole.The MiniITX case examples were an attempt to broaden your perspective, in response to "This is one of the best quiet cases for GPU thermals out there per SPCR". The Core 500 shows what an out-of-the-box solution can achieve when there's some good engineering behind it. If the default setup already delivers a relaxed GPU, there's scope to change the case fans for quieter models and otherwise tune the cooling/acoustical compromise.
That's a good idea I hadn't really considered before. Clocker suggested the same. Yes, there is some room for that in the case. I'm not entirely sure where to put it for the lower rear exhaust fan, but I have some ideas for the top front one.Do you have any room in your chassis to experiment with ducts for managing airflow? I have no idea what it looks like in your new baby but a cardboard shroud doesn't seem like an unreasonable step in experimentation.
That's also what I was thinking with my last comment. Instead of cardboard, plastic wrap might be able to give a sense of pressure differential if it is not too small. Plastic wrap might be able to temporarily replace the side cover for a smoke test.Do you have any room in your chassis to experiment with ducts for managing airflow? I have no idea what it looks like in your new baby but a cardboard shroud doesn't seem like an unreasonable step in experimentation.
You could start with just a simple case divider to isolate the influences.That's a good idea I hadn't really considered before. Clocker suggested the same. Yes, there is some room for that in the case. I'm not entirely sure where to put it for the lower rear exhaust fan, but I have some ideas for the top front one.