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Thanks, I will give that a try.

I have a Performa 600 with a DayStar Turbo 040 accelerator. The option to Disable Memory Test is missing in Advanced Features in the QuadControl Control Panel. I have tested the accelerator in a IIci and the did not have that issue. Is this expected behavior in a Performa 600? I have attached a...

Here are the benchmark results for Norton Utilities SI v3.5.3. It definitely shows the FPU is running faster than the 33MHz I originally thought.

I tested a System 7.5.3 boot floppy and it works just fine with the accelerator installed.

I have tried all the above and I am satisfied the the FPU is running @50MHz after all the testing and thankful for everyone's input here. I am certainly not going to loose any sleep over it:) Thanks!

I already tried that and the results with the Interware Booster 030 were the same.

Here is a comparison between the LC III with the Interware Booster and the stock configuration with a FPU using SpeedOMeter v3.23. This is running on System 7.1 w/Update 3.0 & QuickSANE v2.2

Yes, they are connected.

I will check this weekend and let you know.

I have a mutlimeter.

Using PowerDemo from Daystar shows the 68030 @50MHz and the 68882 @33MHz. The SpeedOMeter 3.23 results confirm the FPU score is indeed running at 33MHz. The Performance Test result is 35 whereas a 50MHz 68882 should be around 50. I did not expect the FPU to run at 33MHz with this accelerator...

Pictures of the accelerator is are in Post #4 in this thread.

I got the Interware Booster 30-LC52550F and it works with my 25MHz LC III. The interesting thing is the 68882 is only clocked to 33MHz and not 50MHz. This seems to be the case on some accelerators. My MicroMac Thunder LC is 33MHz for the 68030, but only 16MHz for the 68882 and my MicroMac Diimo...

It should have the exact same performance as 33MHz LC III/Performa 460. The only difference is the clock speed and the fact it has a 33MHz 68030 on the motherboard.

My LC III is running at 33Mhz, but I have access to 25MHz model I gave to a friend and we can just do a swap of the motherboards. It should all be good. Thanks for the info!

This is the Interware 30-LC5250F accelerator I am getting. I am rolling the dice that it works and is compatible. We shall find out.

Thanks, that is what I thought, but just wanted to make sure.

Is the PDS slot in a LC III electrically compatible with the PDS slot in a LC 520/550? I am look at getting an accelerator for my LC III and it is listed for a LC 520/LC 550. Thanks!

I was pointed to this open source project on Github for making your own 4MB PAL SIMMs in case you anyone is interested. https://github.com/kr239/Macintosh-IIx-RAM-SIMM

If you look at the listing on Tindie the last batch was sold Jan 19th 2023. I just wonder if anymore of these are going to be made given the length of time since they were last sold. I got lucky and there was a listing for 2 sets of 4x4MB PAL SIMMs on eBay that are tested with 30 day returns. I...