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NVIDIA MCPX (labeled MCP1 on the die) southbridge from the original Xbox. Alleged to contain the secret boot ROM.

Made by a 150 nm 7-metal process by TSMC according to

From preliminary die inspection, stack-up looks to be:

  • M7 = bond pads, horizontal power distribution, long-range horizontal interconnect
  • M6 = routing to bond pads, vertical power distribution, long-range vertical interconnect
  • M5 = medium-range vertical interconnect
  • M4 = medium-range horizontal interconnect
  • M3 = short-range vertical interconnect
  • M2 = short-range horizontal interconnect
  • M1 = intra-cell routing



  nVIDIA (R)
  F45819.1 0142B2


Size is approximately 5300 x 5300 μm (28.1 mm2)

Die logo

Mask rev markings. Looks very similar to the GeForce 2 MX suggesting the two are made on the same, or nearly same, process. This is a little odd since the GeForce 2 was supposed to be 180 nm and sources list this chip as 150.

Classic NVIDIA diagonal bond pads

Possible boot ROM?

Multi-focus stack down interconnect. Looks like 3 vertical, 3 horizontal layers plus M1 (not visible in this view).

Closeup near bottom right showing cell sizes

azonenberg/nvidia/mcpx.txt · Last modified: 2015/01/04 17:50 (external edit)