New 5 Amps Power Supply and Active Cooler
CPU Stress Tests
The fan on my new active cooler did not spin, I might have broken the JST connection on trying to insert the fiddly little thing. However, I have run some stress tests by plonking my cheap old Pi 4 fan on top of the dead new one. That and the new heatsink appear to do a good job and might be recommended as a useful backup arrangement.
Below are temperature graphs of my earlier integer and floating point tests using 64 KB and 512 KB of data. Maximum 4 thread performance was 73 GFLOPS for both floating point tests. For integers it was 240 GB/second at 64 KB then 160 GB/second at 512 KB, the latter being the hottest with data transfers reading from L2 cache as opposed to L1 at 64 KB.
The (part) active cooler graph indicates less than 80°C for all measurements, others demonstrating constant maximum CPU MHz and performance. The other graph only covers the integer tests, with and without the old Pi 4 fan. Then, using 64 KB with the fan, CPU MHz throttling was just about avoided.
On running without an operational fan, it is commendable that the Pi 5 can continue running at those high temperatures, wherethrottled performance can be demonstrated that it is far superior to that from a super cooled Pi 4.
Heavy System Stress Test
This is a repeat the earlier test, comprising INTitHOT64g12, with 2 threads at 64 KB, MP-FPUStress64g12 with 2 threads at 512 KB, burnindrive264g12 to a PC via Ethernet, burnindrive264g12 to a USB 3 disk drive and videogl64C12. They were run with the Active Cooler enabled, initially using the new 5 amps power supply, then controlled by the 4 amps PoE arrangement. The two drive MB/second results are reading speeds, the second being for repetitive reading of the same blocks, representing bus speed where the drive has a buffer.
There were some differences in results of the two sessions at 5 amps, but nothing unusual for a mixed workload. The first test at 4 amps failed, as earlier, with disk reading errors being recorded, this time after 100 seconds. The second one at 4 amps ran successfully, essentially providing the same levels of performance as those at 5 amps. For the first 4 amps test, benchmark results, that were recorded, indicated slower performance.
There were noticeable differences in measured power where the input level was less than 5 volts, using the 4 amps supply. For some inexplicable reason, the failed test input current recording was particularly low.
An additional test was run excluding the floating point program, using the 4 amps power supply and 512 KB data size for INTitHOT via 4 threads. The latter is slower than at 64 KB but requiring a higher amperage and CPU temperature. Higher USB voltage might have helped in avoiding disk errors.
CPU Stress Tests
The fan on my new active cooler did not spin, I might have broken the JST connection on trying to insert the fiddly little thing. However, I have run some stress tests by plonking my cheap old Pi 4 fan on top of the dead new one. That and the new heatsink appear to do a good job and might be recommended as a useful backup arrangement.
Below are temperature graphs of my earlier integer and floating point tests using 64 KB and 512 KB of data. Maximum 4 thread performance was 73 GFLOPS for both floating point tests. For integers it was 240 GB/second at 64 KB then 160 GB/second at 512 KB, the latter being the hottest with data transfers reading from L2 cache as opposed to L1 at 64 KB.
The (part) active cooler graph indicates less than 80°C for all measurements, others demonstrating constant maximum CPU MHz and performance. The other graph only covers the integer tests, with and without the old Pi 4 fan. Then, using 64 KB with the fan, CPU MHz throttling was just about avoided.
On running without an operational fan, it is commendable that the Pi 5 can continue running at those high temperatures, wherethrottled performance can be demonstrated that it is far superior to that from a super cooled Pi 4.
This is a repeat the earlier test, comprising INTitHOT64g12, with 2 threads at 64 KB, MP-FPUStress64g12 with 2 threads at 512 KB, burnindrive264g12 to a PC via Ethernet, burnindrive264g12 to a USB 3 disk drive and videogl64C12. They were run with the Active Cooler enabled, initially using the new 5 amps power supply, then controlled by the 4 amps PoE arrangement. The two drive MB/second results are reading speeds, the second being for repetitive reading of the same blocks, representing bus speed where the drive has a buffer.
There were some differences in results of the two sessions at 5 amps, but nothing unusual for a mixed workload. The first test at 4 amps failed, as earlier, with disk reading errors being recorded, this time after 100 seconds. The second one at 4 amps ran successfully, essentially providing the same levels of performance as those at 5 amps. For the first 4 amps test, benchmark results, that were recorded, indicated slower performance.
There were noticeable differences in measured power where the input level was less than 5 volts, using the 4 amps supply. For some inexplicable reason, the failed test input current recording was particularly low.
An additional test was run excluding the floating point program, using the 4 amps power supply and 512 KB data size for INTitHOT via 4 threads. The latter is slower than at 64 KB but requiring a higher amperage and CPU temperature. Higher USB voltage might have helped in avoiding disk errors.
Code:
INT MP CPU PMIC OpenGL Drive LAN Volts Amps MB/sec MFLOPS MHz Volts °C °C FPS MB/s MB/s5A SupplyPower 5.15 2.38 Min 62371 19494 2400 0.8833 37.8 40.0 59.0 52.8 35.1USB 4.92 0.53 Avg 75234 24713 2400 0.8833 63.5 62.4 64.4 117.7 36.7 Max 89243 28868 2400 0.8833 67.5 65.0 68.0Repeat Min 63097 23625 2400 0.8833 38.4 40.1 60.0 58.5 28.6 Avg 77075 25451 2400 0.8833 64.4 62.8 66.4 159.1 31.7 Max 89625 27352 2400 0.8833 68.6 66.0 71.04A SupplyPower 4.88 1.98 Min 56159 18062 2400 0.7200 37.3 37.9 44.0 N/A 31.3USB 4.71 0.54 Avg 63134 20087 2400 0.8567 51.5 49.9 56.6 N/A N/AFAILED Max 69947 23773 2400 0.8840 59.8 57.2 70.0RepeatPower 4.84 2.39 Min 63472 22513 2400 0.8840 37.8 39.5 59.0 52.6 30.1USB 4.71 0.54 Avg 76104 25127 2400 0.8840 59.4 58.4 64.7 159.0 32.2 Max 84488 27214 2400 0.8840 62.6 60.7 70.04A SupplyPower 5.07 2.74 Min 95040 2400 0.8833 35.1 38.6 50.0 57.3 28.6USB 4.81 0.53 Avg 100302 2400 0.8833 65.0 64.3 61.9 156.8 31.4 Max 104684 2400 0.8833 69.2 67.2 66.0 Statistics: Posted by RoyLongbottom — Wed Jan 17, 2024 5:31 pm