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Anandtech: A Look at the Jasper Xbox 360
>> From anandtech.com:
[QUOTE]
* Identifying a Jasper
The important text is the current rating on the 12V line, which is immediately to the left of the current rating on the 5V rail. The three options here are 16,5A, 14,2A and 12,1A. All that really matters is the last digit, if you see a 5 then you've got a Zephyr, if you see a 2 you've got a Falcon (most likely) or if you see a 1 you've got a Jasper (take it and run).
Now some Jaspers have been mislabeled as 14,2A, but no Zephyr or Falcon has been mislabeled as 12,1A. The explanation is simple, this rating indicates what sort of power supply you'll need to use with the machine. Zephyr and Falcon boxes can't run with only 12.1A on the 12V rail, you'd end up with a box that either crashed a lot, rebooted or had other undesirable behavior (assuming it would even start, assuming you could even find a power supply that you could plug into it). There's only one Xbox 360 power supply that can deliver a max of 12.1A on the 12V rail, that is the 150W power supply that is keyed to only work on Jaspers. Find a machine with 12,1A written on the back of it and you've got yourself a Jasper.
* Confirming Your Jasper
The first Xbox 360 (Xenon) needs a 203W power supply. Falcon needs a 175W power supply but can also work with the 203W unit (it just doesn't need to draw that much power so the 203W unit is overkill, but it'll work). Jasper needs 150W but can work with a 203W and a 175W. In other words, the Xbox 360 power supplies are forwards but not backwards compatible.
* Jasper Dissection
Xbox 360 Revision: CPU | GPU | eDRAM
- Xenon/Zephyr: 90nm | 90nm | 90nm
- Falcon/Opus: 65nm | 80nm | 80nm
- Jasper: 65nm | 65nm | 80nm
The new GPU is around 77% of the die area of the old GPU, but the eDRAM appears to be unchanged at 80nm (chalk up the difference of 4mm to differences in measuring the die with a ruler vs. calipers). Compared to the Xenon platform, the GPU is now 66% of the original GPU die size, meaning the GPU actually shrunk more than the CPU in the move to 65nm.
* Power Consumption
Xbox 360 Rev: Idle | Halo 3 | Rockband2 | Gears of War2 | BioShock
-Xenon : 2.3W | 155.7W | 177.8W | 167.7W | 177.1W | 172.0W
-Falcon: 2.8W | 101.4W | 121.2W | 112.8W | 121.5W | 115.5W
-Jasper: 2.0W | 093.7W | 105.9W | 101.0W | 105.9W | 098.1W
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Full Story: anandtech.com (5 pages)
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