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IDT R5000
  IDT R5000 79RV5000-150G
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The IDT R5000 Processor
The R5000, designed by Quantum Effect Devices (QED), replaced the R4600 in 1996. The R5000 FPU had more flexible single precision floating-point scheduling than the R4x00, and as a result, R5000-based SGI Indys had much better graphics performance than similarly clocked R4400 Indys with the same graphics hardware. SGI gave the old graphics board a new name (XL8 -> XGE8) when it was combined with R5000 in order to emphasize the improvement.
References:  MIPS R5000 introduction  MIPS R5000: Fast, Affordable 3-D  IDT 79RV5000 Documents  R5000 at SGIstuff
IDT R5000 79RV5000-150G
IDT R5000 79RV5000-150G Top Side
IDT R5000 79RV5000-150G Back Side
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Core Frequency:150 MHz
Board Frequency:50 MHz
Clock Multiplier:3.0
Data bus (ext.):64 Bit
Address bus:64 Bit
Circuit Size:0.32
Core / I/O Voltage:3.3 / 3.6 V
Manufactured:week 35/1996
Made in:USA
L1 Cache:32+32 KB
Package Type:Ceramic
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