SAM 460 poor performance, high price

[Piru]

As for memory allocation speed, when initiating any transfer, is this step not required?

Of course it is not. These memory speed benchmarks only allocate the buffer once, and this time spent allocating the memory is not accounted.

I don't know the size of the transfers in question but let's say they were done in 1k chunks.  The memory must be allocated for the transfer to begin.  If the tests included those requests then they would be skewed towards the OS with the most efficient allocator.

The smaller the chunk, the more exagerated the results of the the transfer.

You're seriously confused.

On a lower level, was the OS4 transfer done in full DDR2 burst mode?  If not you wont' see speeds over DDR1.

If that is the case then this SAM460 has a lot more problems the issues listed so far...

[Piru]

Aren't you the one changing the subject?

I think I have been quite consistent.

I would expect the memory tests to have favored it.

I think we're getting to the core of the issue here. You expected something to to be true, made a bogus claim and now are unwilling to back off and admit your mistake.

You then tried to blame to OS...which we know is your ultimate goal.

I didn't bring quake3 to this thread. I merely commented your contradictory and clearly bogus claims.

[Piru]

If the fpga is the memory controller then it can be fixed.

The memory controller is inside the AMCC460 CPU.

On-chip DDR1/2 SDRAM controller with 32/64-bit interface, up to 3.2 GBps peak data rate and optional ECC

[Piru]

If SAM460 can use memory faster than DDR2-400 then it will outperform the G4's DDR-400 memory.  These are facts.

According to Applied Micro the AMCC460 does max DDR2-400 (peak speed 3200 MB/s). Mac mini G4 uses 166MHz bus though so DDR-333. That evens up the situation a bit, but for some reason Mac mini G4 still is faster.

You can look at MacOS running Quake 3 and see that on the same hardware it's twice as fast as MOS. So while yes the driver is not good on OS4, it's still not perfect on MOS

Until RadeonHD has 3D drivers the whole question of Quake 3 performance is academic anyway.

And just as a final remark the work in progress MorphOS 3D drivers already run Quake 3 faster than Mac OS X.

[Piru]

There appears to be some confusion about what it actually supports via the wording.  System designers usually only reference the internal or bus clock and not the "labelling".

Applied Micro says "up to 3.2 GBps peak data rate". This translates to DDR2-400 (PC2-3200, 100MHz memory bus).

[Piru]

Because a person who reads this thread would eventually decide against AmigaOne hardware and buy Mac then end up buying MorphOS license = profit for the OP.

People are of course free to express their opinion about me but here I must take an exception. I am not getting any "profit" from this. I have never collected any money from the MorphOS registrations and I don't intend to do so in the future. My financial status allows me to keep my hobby that: a hobby.

The money from the registrations is mostly used to keep the web site, registration server and other support infrastructure running. It is also used to obtain hardware for potential future ports.

Any claims that I would somehow get financial benefit from this is clearly nonsense.

So, the time spend on posting on this forum is well calculated ...  it's directly filling their pockets.

Frankly, I find this just offensive.