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Old 10 June 2014, 14:35   #1
amilo3438
Amiga 500 User
 
Join Date: Jun 2013
Location: EU
Posts: 1,114
68000 CE 8x speed problem ?!

Below are some tests that explain/show influence of MHz and Fast RAM to A500 speed:

Case 1) A500 7.09MHz 512 Chip + 512 Slow RAM = 553 Dhrystones (pic.1)

Case 2) A500 7.09Mhz 512 Chip + 1Mb Fast RAM = 729 Dhrystones (pic.2) ... ~1.32 X Case1

Case 3) A500 14.18MHz 512 Chip + 512 Slow RAM = 602 Dhrystones (pic.3) ... ~1.09 x Case1

Case 4) A500 14.18MHz 512 Chip + 1MB Fast RAM = 1520 Dhrystones (pic.4) ... ~2.75 x Case1 (OR ~2.08 x Case2)

EDIT: In addition...

Case 5) A500 28.4MHz 512 Chip + 512 Slow RAM = 640 Dhrystones (no pic.) ... ~ 1.16 x Case1

Case 6) A500 28.4MHz 512 Chip + 1MB Fast RAM = ... In SySinfo this test goes crazy (over 3x A4000@25) ?!? ... see EDIT3 below!

The test Case 6 was set to CE 8x speed (same as Case 5), so why it goes crazy, the reason cant be only because of Fast RAM ? ... test done with WinUAE2810b6.

EDIT2: If same test as Case 6 but with CPU 68020 instead of 68000 (or 68010) and it works fine !!! (SySinfo doesnt go crazy )


EDIT3: With a lot of reluctance the WinUAE problem finally fixed (see post 11), so now is able to complete the test:

Case 3) A500 14.18MHz 512 Chip + 512 Slow RAM = 593 Dhrystones (no pic.) ... ~1.07 x Case1

Case 4) A500 14.18MHz 512 Chip + 1MB Fast RAM = 1471 Dhrystones (no pic.) ... ~2.66 x Case1 (OR ~2.02 x Case2)

Case 5) A500 28.4MHz 512 Chip + 512 Slow RAM = 620 Dhrystones (no pic.) ... ~1.12 x Case1

Case 6) A500 28.4MHz 512 Chip + 1MB Fast RAM = ... 2956 Dhrystones (pic.5) ... ~5.35 x Case1 (OR ~4.05 x Case2 AND ~2.01 x Case4)
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Last edited by amilo3438; 11 June 2014 at 18:52.
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