Xbox 360:GPU Retrofit

This page is intended for advanced technicians only. If you do not have advanced component and BGA rework skills, you will not be able to complete the process successfully.

Some GPUs can be retrofitted onto earlier boards. This page contains instructions for what changes need to be done in order for the retrofit to work.

Xenon

All variants of the phat GPU can be retrofitted onto a Xenon motherboard. (Demo Video with GPU RHEA)

Guide By: Senator_man

Limitations

Read this BEFORE doing anything with board

90nm chips are work without huge modifications on board because they very similar to factory ones, but there is still some aspects i must mention:

Limitations of board with 90nm GPU:

• Standart JTAG wiring will cause RROD with 0021 error code. So use this one:
  • 
• Board with Samsung RAM will NOT boot RGH2, because on Xenon it uses Falcon(at least at this moment) bootloader which haven't support for this RAM

Limitations of board with 65nm GPU:

• Retail Xenon firmware will NOT boot because it has no support for 65nm gpu, so you need to to xeBuild as Jasper
• Jasper firmware can NOT be booted without blowing fuse
• Jasper firmware has NO support of Xenon type 1 KV, so Retail nand can be only booted on Elpis motherboard with Jasper firmware
• JTAG is not tested

Instructions

GPU Table

Name	Part Number	Specifics	GPU/eDRAM Lithography	GPU/eDRAM Temp Target	GPU/eDRAM Temp Critical
Y2	X02127	Unreliable	90nm/90nm	80C/82C	100C/102C
Rhea	X810480	Unreliable with black underfill	90nm/90nm	75C/78C	100C/102C
Rhea (revisited)	X810480 X816970 X816971	All chips with white underfill reliable	90nm/90nm	75C/78C	100C/102C
Elpis	X819195	no need to do PCI_e swap	90nm/90nm	75C/78C	100C/102C
Zeus	X810478 X817793	-	65nm/90nm	71C/73C	90C/92C
Kronos	X820894	-	65nm/65nm	75C/77C	90C/92C

Install GPU

• Replace 90nm U4D1 with 90nm or 65nm

PCI_e Swap (not needed for Elpis GPU)

Main modification to install newer chips, scheme of wiring:

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Example of perfoming this mod:

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Modification for 65nm

GPU part of your board is now basically is Zephyr_B/C, if you installing 65nm chip follow instructions down below. This is no need to do any other changes for 90nm chip.

Modify Firmware

• Use J-Runner with Extras to dump the nand
• RGH/JTAG the console to get the CPU key
• Set the required XeBuild options and build the image
• Open the SMC Config Editor from the Nand menu, and update the thermal targets from the table above
• Write the nand to the console

Zephyr_B/C

Both variants of the 65nm GPU can be retrofitted onto a Zephyr_B/C motherboard. (Demo Video)

Guide By: Octal450

Instructions

GPU Table

Name	Part Number	GPU/eDRAM Lithography	GPU/eDRAM Temp Target	GPU/eDRAM Temp Critical
Zeus	X810478 X817793	65nm/90nm	71C/73C	90C/92C
Kronos	X820894	65nm/65nm	75C/77C	90C/92C

Install GPU

• Replace 90nm U4D1 with 65nm

Set VID 1.075V

• Remove 0 ohm R8B9
• Remove 0 ohm R8B10

Set FSB/PCIe/Memory Calibration

• FSB:
  • Remove 4.87K ohm R5R3
  • Install 40.2 ohm as pullup to nearby V_GPUCORE
    • You can either use a wire to the capacitor as shown, or scrape to expose V_GPUCORE voltage plane
    • 

• PCIe:
  • Remove 1.47K ohm R4R3
  • Remove 562 ohm R5D1
  • Replace 2K ohm R5D2 with 49.9 ohm
• Memory:
  • Replace 40.2 ohm R4R8 with 240 ohm
  • Replace 40.2 ohm R4T1 with 240 ohm

Tie V_GPUPCIE to V_GPUCORE

• Remove IC U5C1
• Install jumper as shown to tie V_GPUPCIE to V_GPUCORE
  • Use a 28awg or thicker gauge wire
  • Be careful not to short to any nearby components or pads
  • Strongly recommended to cover jumper with PCB mask
  • 

Modify Firmware

• Use J-Runner with Extras to dump the nand
• Change the type to Jasper 16MB, then RGH the console to get the CPU key
• Set the required XeBuild options and build the image
• Open the SMC Config Editor from the Nand menu, and update the thermal targets from the table above
• Write the nand to the console

Falcon

Both variants of the 65nm GPU can be retrofitted onto a Falcon motherboard. (Demo Video)

Guide By: Octal450

Instructions

GPU Table

Name	Part Number	GPU/eDRAM Lithography	GPU/eDRAM Temp Target	GPU/eDRAM Temp Critical
Zeus	X810478 X817793	65nm/90nm	71C/73C	90C/92C
Kronos	X820894	65nm/65nm	75C/77C	90C/92C

Install GPU

• Replace 90nm U4D1 with 65nm

Set VID 1.075V

• Remove 0 ohm R8B9
• Remove 0 ohm R8B10

Set FSB/PCIe/Memory Calibration

• FSB:
  • Install 40.2 ohm R4R9
  • Remove 4.87K ohm R5R3
• PCIe:
  • Remove 1.47K ohm R4R3
  • Remove 562 ohm R5D1
  • Replace 2K ohm R5D2 with 49.9 ohm
• Memory:
  • Replace 40.2 ohm R4R8 with 240 ohm
  • Replace 40.2 ohm R4T1 with 240 ohm

Tie V_GPUPCIE to V_GPUCORE

• Remove 0 ohm R4C31
• Install 0 ohm R4P13
• Install 0 ohm R4P14
• Remove IC U5C1

Modify Firmware

• Use J-Runner with Extras to dump the nand
• Change the type to Jasper 16MB, then RGH the console to get the CPU key
• Set the required XeBuild options and build the image
• Open the SMC Config Editor from the Nand menu, and update the thermal targets from the table above
• Write the nand to the console

Jasper

The Kronos GPU can be retrofitted onto a Jasper motherboard. (Demo video)

Guide By: Octal450

Instructions

GPU Table

Name	Part Number	GPU/eDRAM Lithography	GPU/eDRAM Temp Target	GPU/eDRAM Temp Critical
Kronos	X820894	65nm/65nm	75C/77C	90C/92C

Install GPU

• Replace Zeus U4D1 with Kronos

Modify Firmware (Optional)

• This step is optional, Zeus targets 71C/73C, there is no harm by running the chip a few degrees cooler
• Use J-Runner with Extras to dump the nand
• Open the SMC Config Editor from the Nand menu, and update the thermal targets from the table above
• Write the nand to the console