Memory Performance Benchmarks on New G4/466 vs. Prev. G4/450

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1/11/01 Thursday's News: Story Detail

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Memory Performance Benchmarks on New G4/466 vs. Prev. G4/450

Last Updated: 1/11/2001, 9:07 PM

A reader sent memory benchmark results of tests with a 100mhz bus G4/450 system vs. a new G4/466 system with 133MHz bus. In most cases the new G4 showed substantially higher performance (up to 140%).

Mike,
I thought you might be interested in these measurements I made of the memory throughput of the new machines. Attached is a comparison - the numbers in the chart are in Mb/s. (The CopyBits scores are attributable to the nVidia card). [Initial driver release] The measurements were taken with a tool I wrote.
Kent"

I would be very curious to see what the results would be with a 7450 CPU (256k on-chip L2 cache and 1MB L3 cache) with a Radeon card.

Kent's test results are in the table below. (I'm assuming the numbers are MB/sec rates).

Test	450/100 (old G4)	466/133 (new G4)	% improvement:
Vector Writes to GDevice	124.9	198.3	59%
Vector Writes Cache Inhibited	487.3	973.6	100%
Vector Writes 431.3	583	35%
GPR Writes to GDevice	50.1	60.2	20%
GPR Writes reversed	541	704.5	30%
GPR Writes (cache)	572.3	706.3	23%
GPR Writes byte reversed uncached	122.8	240.3	96%
GPR Writes Cache Inhibited	244.8	486.5	99%
GPR Writes	353.9	554.8	57%
FPR Writes (cache)	584.7	619.5	6%
FPR Writes Uncached	245.4	487	98%
FPR Writes to GDevice	82.6	198.3	140%
FPR Writes	369.2	577	56%
CopyBits 8	181.6	153.3	-15%
CopyBits 32	172.4	165.7	-4%
CopyBits 16	185.1	168.3	-10%
BlockMoveData 512K	355.3	522.8	47%
BlockMoveData 2Mb	206.1	295.3&	43%
BlockMoveData 256K	498.8	522.5	5%
BlockMoveData 1Mb	206.7	307.4	29%
BlockMoveData 1k	1939.6	2300.9	19%

For more info on the new G4s - see our page with comments, features, photos and pricing.

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