Which is better IDEFix Express or Powerflyer?

[humppa]

I read in the Amigakit website that "Transfer rates of more than 5.1 MBytes per second are reached with the express adapter".  How much faster is that from the standard IDE port of the Amiga 1200?

Well, 5.1 MB/s is about 2x of what you get from a standard (non-Express) adapter. You will be a lucky guy if you manage to achieve these transfer rates with the Express-adapter.
The actual speed you get from it strongly depends on your accelerator. Using an Apollo 1240/40 I nearly achieved 5 MB/s. Then I switched to a BPPC 175/040/25 and the transfer rates dropped significantly.
Then I finally made the switch to SCSI: 7.8MB/s with very low  CPU utilization, not a completely hogged Miggy (as with the Powerflyer).

[humppa]

@tjaoz

As can be seen from Sysinfo, they overclocked the 68040 to 44.4 Mhz in order to have transfers more synchronous which further speeds up transfers.
The Sysinfo drive benchmark is buggy anyway and you can't use it for comparison.

DiskSpeed 4.2 results (at the bottom) are more realistic. Anyway, I would always prefer SCSI. I don't care about fast transfers as long as MP3 playback gets choppy each time I copy a larger file. With SCSI you won't have any of these problems.

Moreover, it's not only about speed. The Idefix Express is less of a hassle to fit, especially when using a Mediator. The Powerflyer is much more unreliable.

[humppa]

No. The Sysinfo drive benchmarks are not buggy.

They are not reliable. When I had the Idefix Express connected, my Seagate drive always reported something around 5MB/s, the values kept on changing each time I measured, everything ok there. The other drive (Quantum) always reported exactly the same value of about 7.8MB/s (!): A value that is not realistic for the device. Further, it is very unlikely that the raw speed always exactly stays at the same byte without any fluctuation.
I have heard similar reports from other users. The speed-test in Sysinfo is a nice add-on, but I would always prefer dedicated programs which measure more than just raw speed.

In the end we are interested in real-life performance, not something like those buggy values I got from Sysinfo.

You cannot compare apples to oranges. I mean you cannot compare Sysinfo IDE-Fix Express results with DiskSpeed FastATA results, or to compare the results from systems equipped with the different turbo cards.

Congrats. But you started comparing an Apollo clocked at 44.4Mhz with SysInfo benchmark to a number given by me for an undefined program and a clock speed of 40Mhz. So who actually compared apples to oranges?  :lol:

I have FastATA under the Mediator board and I did not have any problem with installation.

Fine. I did not say that it won't work. I just have heard many reports of people who had problems with the installation and who had problems after the installation because the whole construction was rather unstable.