Thermal Algorithm: Difference between revisions
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== Temperature Targets == | == Temperature Targets == | ||
The [[ | The system [[fan]] is controlled by the [[SMC]] dynamically to keep the thermal sensor readings at or below the targets. The previous value of each sensor is used to determine the rate of increase, in order to prevent overshooting the targets. These temperatures are designed to balance being a large margin below the [[#Trip Temperatures|trip temperatures]], while keeping the acoustics to a minimum. | ||
=== Original Xbox 360 === | === Original Xbox 360 === | ||
Xenon (Early) refers to the targets that only a small number of launch units used. The Mid/Late tables were applied fairly quickly. | |||
{|class="wikitable" | {|class="wikitable" | ||
! Board !! CPU !! GPU !! eDRAM | ! Board !! CPU !! GPU !! eDRAM | ||
|- | |- | ||
| [[Xenon (Motherboard)|Xenon]] || 80C || 83C || 85C | | [[Xenon (Motherboard)|Xenon]] (Early) || 80C || 97C || 100C | ||
|- | |||
| [[Xenon (Motherboard)|Xenon]] (Mid/Late) || 80C || 83C || 85C | |||
|- | |- | ||
| [[Zephyr#Zephyr_A|Zephyr_A]] || 80C || 83C || 85C | | [[Zephyr#Zephyr_A|Zephyr_A]] || 80C || 83C || 85C | ||
| Line 23: | Line 27: | ||
|} | |} | ||
'''Note:''' Refurbished Xenon and Zephyr_A motherboards are modified with the temperature targets from | '''Note:''' Refurbished Xenon and Zephyr_A motherboards are modified with the temperature targets from Falcon. | ||
=== Xbox 360 S and E === | === Xbox 360 S and E === | ||
Latest revision as of 13:03, 15 October 2024
The Xbox 360 uses a dynamic Thermal Algorithm in order to control the temperatures of the CPU, GPU, and eDRAM dies.
Temperature Targets
The system fan is controlled by the SMC dynamically to keep the thermal sensor readings at or below the targets. The previous value of each sensor is used to determine the rate of increase, in order to prevent overshooting the targets. These temperatures are designed to balance being a large margin below the trip temperatures, while keeping the acoustics to a minimum.
Original Xbox 360
Xenon (Early) refers to the targets that only a small number of launch units used. The Mid/Late tables were applied fairly quickly.
| Board | CPU | GPU | eDRAM |
|---|---|---|---|
| Xenon (Early) | 80C | 97C | 100C |
| Xenon (Mid/Late) | 80C | 83C | 85C |
| Zephyr_A | 80C | 83C | 85C |
| Zephyr_B/C | 80C | 75C | 78C |
| Falcon | 80C | 75C | 78C |
| Elpis | 80C | 75C | 78C |
| Jasper | 80C | 71C | 73C |
| Tonasket | 80C | 75C | 77C |
Note: Refurbished Xenon and Zephyr_A motherboards are modified with the temperature targets from Falcon.
Xbox 360 S and E
Applies to Trinity, Corona, Waitsburg, Stingray, and Winchester.
| CGPU Hot Spot | CGPU Average | eDRAM |
|---|---|---|
| 82C | 78C | 76C |
Trip Temperatures
At these temperatures, the SMC enters the EC_THERMAL error state in order to cool down. It should be noted that these temperatures are a margin of error below the actual chip Tjmax, which is significantly below the temperature where the chip would stop operating correctly. As a result, these trip points will always be quite a bit before a catastrophic failure due to thermals would occur.
Original Xbox 360
| Board | CPU | GPU | eDRAM |
|---|---|---|---|
| Xenon | 100C | 110C | 117C |
| Zephyr_A | 100C | 110C | 117C |
| Zephyr_B/C | 100C | 100C | 102C |
| Falcon | 100C | 100C | 102C |
| Elpis | 100C | 100C | 102C |
| Jasper | 95C | 90C | 92C |
| Tonasket | 95C | 90C | 92C |
Note: Refurbished Xenon and Zephyr_A motherboards are modified with the trip temperatures from Elpis/Falcon respectively.
Xbox 360 S and E
Applies to Trinity, Corona, Waitsburg, and Stingray.
| CGPU Hot Spot | CGPU Average | eDRAM |
|---|---|---|
| 89C | 82C | 82C |
Applies to Winchester.
| CGPU Hot Spot | CGPU Average | eDRAM Area |
|---|---|---|
| 91C | 82C | 91C |