GPU Retrofit: Difference between revisions

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''' Install GPU '''
''' Stuff GPU '''
* Replace 90nm U4D1 with 65nm
* Replace 90nm U4D1 with 65nm


''' Set VID 1.075V '''
''' Set VID 1.075V '''
* Remove 0 ohm 0403 R8B9
* Unstuff 0 ohm 0403 R8B9
* Remove 0 ohm 0403 R8B10
* Unstuff 0 ohm 0403 R8B10


''' Set FSB/PCIe/Memory Calibration '''
''' Set FSB/PCIe/Memory Calibration '''
* FSB:
* FSB:
** Remove 4.87K ohm 0403 R5R3
** Unstuff 4.87K ohm 0403 R5R3
** Install 40.2 ohm 0403 as pullup to nearby V_GPUCORE
** Stuff 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
*** You can either use a wire to the capacitor as shown, or scrape to expose V_GPUCORE voltage plane
*** [[File:Fsbcal65.png|300px]][[File:Fsbcal65b.png|300px]]
*** [[File:Fsbcal65.png|300px]][[File:Fsbcal65b.png|300px]]


* PCIe:
* PCIe:
** Remove 1.47K ohm 0403 R4R3
** Unstuff 1.47K ohm 0403 R4R3
** Remove 562 ohm 0403 R5D1
** Unstuff 562 ohm 0403 R5D1
** Replace 2K ohm 0403 R5D2 with 49.9 ohm 0403
** Replace 2K ohm 0403 R5D2 with 49.9 ohm 0403
* Memory:
* Memory:
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''' Tie V_GPUPCIE to V_GPUCORE '''
''' Tie V_GPUPCIE to V_GPUCORE '''
* Remove IC U5C1
* Unstuff IC U5C1
* Install jumper as shown to tie V_GPUPCIE to V_GPUCORE
* Jump as shown to tie V_GPUPCIE to V_GPUCORE
** Use a 28awg or thicker gauge wire
** Use a 28awg or thicker gauge wire
** Be careful not to short to any nearby components or pads
** Be careful not to short to any nearby components or pads
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''' Install GPU '''
''' Stuff GPU '''
* Replace 90nm U4D1 with 65nm
* Replace 90nm U4D1 with 65nm


''' Set VID 1.075V '''
''' Set VID 1.075V '''
* Remove 0 ohm 0403 R8B9
* Unstuff 0 ohm 0403 R8B9
* Remove 0 ohm 0403 R8B10
* Unstuff 0 ohm 0403 R8B10


''' Set FSB/PCIe/Memory Calibration '''
''' Set FSB/PCIe/Memory Calibration '''
* FSB:
* FSB:
** Install 40.2 ohm 0403 R4R9
** Stuff 40.2 ohm 0403 R4R9
** Remove 4.87K ohm 0403 R5R3
** Unstuff 4.87K ohm 0403 R5R3
* PCIe:
* PCIe:
** Remove 1.47K ohm 0403 R4R3
** Unstuff 1.47K ohm 0403 R4R3
** Remove 562 ohm 0403 R5D1
** Unstuff 562 ohm 0403 R5D1
** Replace 2K ohm 0403 R5D2 with 49.9 ohm 0403
** Replace 2K ohm 0403 R5D2 with 49.9 ohm 0403
* Memory:
* Memory:
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''' Tie V_GPUPCIE to V_GPUCORE '''
''' Tie V_GPUPCIE to V_GPUCORE '''
* Remove 0 ohm 0603 R4C31
* Unstuff 0 ohm 0603 R4C31
* Install 0 ohm 0603 R4P13
* Stuff 0 ohm 0603 R4P13
* Install 0 ohm 0603 R4P14
* Stuff 0 ohm 0603 R4P14
* Remove IC U5C1
* Unstuff IC U5C1


''' Modify Firmware '''
''' Modify Firmware '''
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''' Install GPU '''
''' Stuff GPU '''
* Replace Zeus U4D1 with Kronos
* Replace Zeus U4D1 with Kronos


Latest revision as of 16:40, 24 July 2024

Note  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.

These instructions are not from Microsoft and were created by Octal450 via reverse engineering.

Zephyr_B/C

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

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

Stuff GPU

  • Replace 90nm U4D1 with 65nm

Set VID 1.075V

  • Unstuff 0 ohm 0403 R8B9
  • Unstuff 0 ohm 0403 R8B10

Set FSB/PCIe/Memory Calibration

  • FSB:
    • Unstuff 4.87K ohm 0403 R5R3
    • Stuff 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
      • Fsbcal65.pngFsbcal65b.png
  • PCIe:
    • Unstuff 1.47K ohm 0403 R4R3
    • Unstuff 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

  • Unstuff IC U5C1
  • Jump 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
    • Vpcietie65.png

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, Zeus and Kronos, can be retrofitted onto a Falcon motherboard. (Demo Video)

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

Stuff GPU

  • Replace 90nm U4D1 with 65nm

Set VID 1.075V

  • Unstuff 0 ohm 0403 R8B9
  • Unstuff 0 ohm 0403 R8B10

Set FSB/PCIe/Memory Calibration

  • FSB:
    • Stuff 40.2 ohm 0403 R4R9
    • Unstuff 4.87K ohm 0403 R5R3
  • PCIe:
    • Unstuff 1.47K ohm 0403 R4R3
    • Unstuff 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

  • Unstuff 0 ohm 0603 R4C31
  • Stuff 0 ohm 0603 R4P13
  • Stuff 0 ohm 0603 R4P14
  • Unstuff 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)

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

Stuff 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


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