I have some mobo/CPU swap tests to do later next week. One box has an Arctic LF II 240 w/4 Silverstone FM121's in push/pull at full speed (110cfm each). It currently has an Asus ROG Maximus VIII Hero/7700K in it. The other has an Asus ROG Maximus Hero XI WiFi/9900K coooled by an Arctic LF II 360 w/6 EverFlow R121225BU's (OEM version of the FM121) in push/pull. I also have several 150cfm Delta FFB1212EH-PWM's to play with on hand as well. No side panels will be used on the cases during testing.
I have several different tubes of thermal pastes in my inventory. I happen to have two 4 gram tubes of SYY-157 that haven't been opened yet that I'm going to try out. The test board/CPU combo is a new ASRock Z690 Steel Legend WiFi and the CPU is a new Alder Lake i5-12600K. Since the two test cases have the radiators & fans mounted externally (something Arctic says they think should be done more often with hot running CPU's) swapping the mobo/CPU with a NVMe drive running a fresh install of Win 11 Enterprise is the easiest way to go. I'll be shooting for 5.2GHz on the P-cores and highly suspect the 360 with Delta fans at full speed will give the best results overall. HWINFO will be what I measure the temps with.
I have some MX-5, MX-4, Gelid GC Extreme and AS5 I want to compare against the SYY-157 after I find out which AIO/fan combo gives the lowest temps. Personally I've had the best results with the Gelid over the years. I want to see what combo performs best against my Cosmos II with a Z690 Steel Legend WiFi/12700K @5.2GHz cooled by a LF II 280 mounted externally with 4 Silver Stone 140mm FHP-141's at full speed (171cfm each) in push/pull using Gelid Extreme. It works great now but when I first built it 6 months ago using a LF II 240, MX-4 and the stock Arctic fans mounted internally I had some thermal throttling issues under load even with the side panels off.