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 90 nm and 65 nm 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

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

Limitations of board with 90 nm GPU:

• Standard JTAG wiring will cause a RROD with a 0021 secondary error code. So, use this one:
  • 
• Board with Samsung RAM will NOT boot Glitch2, because on Xenon it uses a Falcon(at the time of writing) bootloader, which doesn't support this RAM configuration.

Limitations of a Xenon board with a 65 nm GPU:

• Retail Xenon firmware will NOT boot because it has no support for 65 nm gpu, so you need to use xeBuild as Jasper
• Jasper firmware can NOT be booted without blowing an efuse
• Jasper firmware has NO support of a Xenon type 1 KV, so a Retail nand can be only booted on an 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	90 nm & 90 nm	75C/78C	100C/102C
Rhea	X810480	Unreliable with distinct die print style	90 nm & 90 nm	75C/78C	100C/102C
Rhea (revised)	X810480 X816970 X816971	All chips with white underfill or newer die print style are reliable	90 nm & 90 nm	75C/78C	100C/102C
Elpis	X819195	no need to do PCI_e swap	90 nm & 90 nm	75C/78C	100C/102C
Zeus	X810478 X817793	-	65 nm & 90 nm	71C/73C	90C/92C
Kronos	X820894	-	65 nm & 65 nm	75C/77C	90C/92C

Install GPU

• Replace 90 nm U4D1 with 90 nm or 65 nm

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 65 nm

The GPU part of your board is now basically is Zephyr_B/C, so if you installing 65 nm chip follow instructions down below. This is no need to do any other firmware changes for a 90 nm 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 65 nm 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	65 nm & 90 nm	71C/73C	90C/92C
Kronos	X820894	65 nm & 65 nm	75C/77C	90C/92C

Install GPU

• Replace 90 nm U4D1 with 65 nm

Set VID 1.075V

• Remove 0 ohm 0403 R8B9
• Remove 0 ohm 0403 R8B10

Set FSB/PCIe/Memory Calibration

• FSB:
  • Remove 4.87K ohm 0403 R5R3
  • Install 40.2 ohm 0403 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 0403 R4R3
  • Remove 562 ohm 0403 R5D1
  • Replace 2K ohm 0403 R5D2 with 49.9 ohm 0403
• Memory:
  • Replace 40.2 ohm 0403 R4R8 with 240 ohm 0403
  • Replace 40.2 ohm 0403 R4T1 with 240 ohm 0403

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 65 nm 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	65 nm & 90 nm	71C/73C	90C/92C
Kronos	X820894	65 nm & 65 nm	75C/77C	90C/92C

Install GPU

• Replace 90 nm U4D1 with 65 nm

Set VID 1.075V

• Remove 0 ohm 0403 R8B9
• Remove 0 ohm 0403 R8B10

Set FSB/PCIe/Memory Calibration

• FSB:
  • Install 40.2 ohm 0403 R4R9
  • Remove 4.87K ohm 0403 R5R3
• PCIe:
  • Remove 1.47K ohm 0403 R4R3
  • Remove 562 ohm 0403 R5D1
  • Replace 2K ohm 0403 R5D2 with 49.9 ohm 0403
• Memory:
  • Replace 40.2 ohm 0403 R4R8 with 240 ohm 0403
  • Replace 40.2 ohm 0403 R4T1 with 240 ohm 0403

Tie V_GPUPCIE to V_GPUCORE

• Remove 0 ohm 0603 R4C31
• Install 0 ohm 0603 R4P13
• Install 0 ohm 0603 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	65 nm & 65 nm	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