December 3rd, 2012 ~ by admin

GPU of the Day: SGI GE7 Geometry Engine

SGI Extreme 4GE7MCM 256 MFLOPS 320,000 Gates

At 2.6oz (75 grams) and 2.25 inches square (6cm) the SIG 4GE7MCM is a beast of a graphics chip.  More properly called a Geometry Engine was, the GE7 was responsible for all the graphics processing in SGI Indigo2 workstations.  The Indigo2 Extreme graphics option consisted of a pair of these MCMs (Multi-Chip-Module).  Each one contains 4 GE7 Geometry Engines providing 32MFLOPS of performance each.  Each GE7 consists of a custom 80,000 gate array from LSI (for a total of 320,000 gates and 128MFLOPS per MCM).  This performance level was, ironically, better then the main system CPU (35MFLOPs for the 200MHz R4400 option).

Each of the black ‘caps’ on the chip covers a single GE7 Engine.  A similar design was used for the XZ Graphics system that had only 4 total GE7 cores.  This was either implemented with 2 of the large MCMs that had only 2 GE7s in them (same package however) that were marked 2GE7MCM, or, later, a single surface mount MCM containing 4 GE7 engines.  All were manufactured by LSI.  In total the Extreme Graphics subsystem had no less then 31 custom gate arrays from LSI for a total of over 1.2 million gates.   At an average of 2 transistors per gate that works out to around 2.5 million transistors, a considerable amount for a graphics system in 1993.  Today’s graphics chips pack in transistors numbering in the billions, the Geforce GTX 680 has a total of 3.54 billion transistors, and performance measured in TFLOPS, again for the GTX 680, 3.09TFLOPS.  Today’s graphics chips cannot, however, compete with the magnificent looks of the GE7’s giant MCM package.

Sources:
Indigo2 Product Guide (PDF)
Indigo2 Technical Report 

 

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January 20th, 2009 ~ by admin

Processor of the day..3 ARM’s on a chip.

LSI developped their Fuision-MPT line of SCSI controller (U320 and fibre channel) back in 2001.  Well before ‘dual core cpus’ hit mainstream.  Continuing from the last post, and found on the same PowerEdge motherboard is an LSI53C1030 Fusion-MPT SCSI controller.  This one was made in 2004, and has not one, nor two, but THREE ARM966E-S 32bit cores on it.

Fusion-MPT ARM9 Tri-core by LSI

Fusion-MPT ARM9 Tri-core by LSI

No idea of the clock speed of the cores, but at 0.18u the cores are good for 200MHz and 250MHz at 0.13u.  The chips system clock is sourced by an 80MHz