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 » Fri May 01, 2020 2:37 pm

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


64MHz
IMG_4831.JPG
IMG_4831.JPG (118.31 KiB) Viewed 392 times

75MHz
IMG_4841.JPG
IMG_4841.JPG (113.11 KiB) Viewed 392 times
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
IMG_4842.JPG (100.38 KiB) Viewed 392 times
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
ste32mhz.jpg (149.69 KiB) Viewed 392 times

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 tuxie » Wed May 06, 2020 10:50 am

Hi,
it would be nice to see a comparison with some games, how the difference feels like.

regards

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Re: SEC 68000 BOOSTER 64 & 75MHz CPU

Post by exxos » Wed May 06, 2020 10:58 am

tuxie wrote:
Wed May 06, 2020 10:50 am
it would be nice to see a comparison with some games, how the difference feels like.
I think the only comparison done was with 32MHz on the STe with frontier. But this booster doesn't do much for games anyway , you need cache for that.

Maybe @Icky or @rubber_jonnie did the comparison video ? I can't remember, but as the SEC is so new, nobody has it other than 3 people yet.
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Re: SEC 68000 BOOSTER 64 & 75MHz CPU

Post by exxos » Sat May 09, 2020 1:34 am

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 » Sat May 09, 2020 9:06 am

exxos wrote:
Sat May 09, 2020 1:34 am
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.
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Re: SEC 68000 BOOSTER 64 & 75MHz CPU

Post by rubber_jonnie » Sat May 09, 2020 10:30 am

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!!
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