Search results

More data points to better see what's going on, and both views on the same plot:

Speed/voltage are configured with resistors on the Sonnet PCB. 68kmla.org/bb/index.php?threads/overclocking-the-sonnet-encore-st-g4.38487/

Is this the same Cube that wouldn't work with the Sonnet "1.2"? What was the problem there? Without much to go on, I would guess it's a power supply problem. What are the voltages at the CPU? Does the Dual work in a different machine? Does the Cube work with a different CPU? You could...

Going by your pictures, that's a test pad. There was never a component connected to it.

I have put 7447/7448 chips onto a variety of other boards, but the 7450 adapter is something different. The only 7450 type CPU boards that will easily fit a Cube are aftermarket already.

The extra cache seems to have a bigger benefit on the slower bus in the Cube:

Someone sent me some 7448 chips to install, and I can report that they also work fine on these boards with the 7400 adapters. The Powerlogix/Newer Technology patch works to fix the firmware on machines that use these boards.

Thanks for sharing your results! I was tinkering a bit with a 7410 in a Pismo and tried it at 1.6v and 500MHz. It was happy with these settings and cool running. I also tried 1.5v, but that was too low for stable operation once it got warm. So one more data point... ymmv.

Does the external drive have its own power, or are you powering it through the Pismo?

What firmware version does your Pismo have?

I added data for the 256KB setting. This plot also shows another way to look at the same data. With zero L2 cache as the baseline, this shows the speed increase with different amounts of cache added. So it's like looking at the performance hit for not having the cache, or the performance gain...

This shows testing with sorting arrays of integers. The size of the arrays increase: 16KB, 32KB, 320KB, 3.2MB, 32MB, and 64MB. The plot shows sorting speed relative to results with 2MB of L2 cache. You can see that less cache is always slower, but there is a range of array sizes where the...

On the G4 CPU, the external memory cache is configured with a register. In the following example a 600MHz 7400 CPU has an actual 2MB of L2 "backside" cache physically existing in hardware, but reduced amounts of 1MB, 512K, and zero L2 cache can also be set in software. This picture is showing...

I think some of the reported L3 issues are firmware or power-saving related. Maybe some of the firmware experts could figure out the details of what it's doing, but I think the later Titaniums would turn off L3 when on battery, or when in "reduced" performance mode. The CPU speed and voltage...

That's neat! --thanks for sharing. It's kinda like hooking up the LEDs on a RAID card and watching them all go.

The manual is available from here: http://www.sonnettech.com/support/downloads/manuals/encore_st_1800_qsg.pdf, among a variety of other places. In there it has information related to the problem you have described: This problem is well documented for a range of aftermarket G4 CPU upgrades...

Hello, welcome to the forum. Sonnet is still around and supports their products. The search function on this site is pretty good too. http://www.sonnettech.com/support/kb/kb.php?cat=582

Thank you joevt, great work! Here is the ROM from my Cube obtained using your build of flashrom:

A "1.2" is probably a 7455 CPU, which would not need the firmware fix. Do you have a picture of the CPU? Does the Cube power up?

Did you get your power supply? How did it work out?