Optiplex 7070sff+Rx6600XT(Detailed photos)
I’ll just list all the parts I used, in case anyone wants to build the exact same setup.
Optiplex 7070 SFF (For ventilation, I used an access panel with an aluminum mesh from a car bumper) i7-9700k+16GB Ram
AXP90X53 GREY + Duct mod (with 125W CPU power draw, the temperature maxes out at 80 degrees; I would have gone with a copper one, didn’t expect to be pushing the CPU this hard, will wait Axp90x53 PRO)
Rx6600xt Powercolor Fighter connect with FENVI PCIe 4.0 Riser 30cm 90° angle(Hot air is drawn in through the cutout in the front panel )
Metalfish Flex 600W PSU + Fan Mod Teucer UT-8015 (I chose this fan because its minimum speed is 1200 RPM; if the CPU is under load, it also speeds up) powered by the CPU via a PWM hub.
I placed the 2.5-inch 1TB HDD behind the power supply; it fit perfectly.
Exhaust fans: TL-B4020 x 2 TL-B6B x 1 Intake fan: ID-COOLING 8010-PWM Fans are connected via IDE Molex to the Rgeek FAN-K11—at 50% speed, the fans are completely silent... The entire system is well ventilated; the temperature of all components when the pc is idle is typically 28–30 degrees.
Total Airflow into the Case:
GPU (40 CFM)
CPU (42.6 CFM)
ID-Cooling (20.2 CFM)
40 + 42.6 + 20.2 = 102.8 CFM
Total exhaust airflow from the case:
2 x B4020 (13.2 CFM)
1 x B6B (19.2 CFM)
PSU line (isolated) Teucer UT-8015 (32.4 CFM)
13.2 + 19.2 + 32.4 = 65.2 CFM
System Stability & Thermals:
CPU: Intel Core i7-9700K
Clock Speed: 4.6 GHz (All-core fixed)
Voltage Offset: -125mV Core / -100mV Cache
IMON Slope: 0.80
Stress Test: OCCT SSE Extreme (Steady)
Power Draw: ~125W real (~95W-100W reported)
Thermals: 80°C peak
GPU Tuning & Stability Profile:
Model: PowerColor Radeon RX 6600 XT Fighter
Core Clock: 2650 MHz
Voltage Offset: -100mV (Undervolt)
Power Limit: 130W
Fan Speed: ~1950 RPM
Stress Test: OCCT Extreme (Steady)
Thermals: 71°C (Edge) / 92°C (Hotspot Peak)
Hotspot Average: 89.25°C