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SEC 68000 BOOSTER 64 & 75MHz CPU

Benchmark screenshots for various boosters & machines.
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exxos
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SEC 68000 BOOSTER 64 & 75MHz CPU

Post by exxos »

In all tests below, CPU only was running faster and ROM is basically the bottleneck and limited to 32MHz. ST RAM is still running at stock speeds.

64MHz
IMG_4831.JPG

75MHz
IMG_4841.JPG
These tests were slightly slower because of wait states had to be added onto ROM access which pushed ROM access speed down to 309% from 368%. important figure is basically integer division anyway.


75MHz + OC ROM
IMG_4842.JPG
The above test was with ROM basically overclocked to get it back to 368%.

In comparison to the simple 8/32MHz STE booster...

ste32mhz.jpg

It is of no real surprise that 64MHz CPU only doesn't give much increase across tests. But I thought I would post this information here as it is still quite interesting just the same. If ROM could run at 64MHz then there would be again another fair speed gain there, but currently it's not really possible. It is also currently questionable at what the point of diminishing returns is in terms of ROM access. from 8Mhz to 16MHz there is about 25% speed gain in tests. 16MHz to 32MHz is again about 25% more. But 32MHz to 64Mhz may not yield a additional 25% again. The underlying problem to all this is the bottleneck of ST-RAM.
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Re: SEC 68000 BOOSTER 64 & 75MHz CPU

Post by exxos »

Maybe @Icky or @PhilC could record elite with your SEC booster ? Not sure what speed you got running at though...
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Re: SEC 68000 BOOSTER 64 & 75MHz CPU

Post by PhilC »

exxos wrote: 09 May 2020 01:34 Maybe @Icky or @PhilC could record elite with your SEC booster ? Not sure what speed you got running at though...
Mines running at 64mhz, I need to set up a way to record it as my hands are way too shaky to video. Will see what I can do. Possibly do a compare between a few different Cpus given time.

Another good 3d benchmark is the Driller demo. The faster the Cpu, the shorter time to run the demo IIRC.
If it ain't broke, test it to Destruction.
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rubber_jonnie
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Re: SEC 68000 BOOSTER 64 & 75MHz CPU

Post by rubber_jonnie »

Ok, I found my 32MHz comparison videos and uploaded to YouTube:

Elite 2: https://youtu.be/3dUnUYS_4yg
Hard Drivin': https://youtu.be/wgngFxUMZLc
Stunt Car Racer: https://youtu.be/bAbi1PPWOaA
Gembench: https://youtu.be/or_p8no8Cdo
Street Fighter 2: https://youtu.be/8-FKrS36gIs

Try not to laugh too much at SF2. It was crap before being boosted to 32Mhz!!
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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