Questions about the CMD640 and RZ1000 bugfix support options

[Christoph Anton Mitterer <cam@mathematica.scientia.net>]

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Hi.

First of all: A happy new year in advance!

Now to my question:
In the kernel-configuration there are the two options:
CONFIG_BLK_DEV_CMD640        CMD640 chipset bugfix/support
and
CONFIG_BLK_DEV_RZ1000        RZ1000 chipset bugfix/support

At least the second of those two seems to cause some little slowdown 
("This may slow disk throughput by a few percent, but at least things 
will operate 100% reliably.").
1) Is the bigfixing code only activated when a buggy chipset is detected 
or do I even have a slowdown with proper a properchipset?
2) Can some help me to find out if my system has one of those two 
chipsets. This might be a dumb question but I'm not sure if 
CMD640/RZ1000 are only some little IDE controller chipsets or if they 
were some kind of Southbridge/Nortbridge.
If got a Epox 8KTA2 mainboard (having VIA VT82C686A/B chipset).

Thanks in advance!

Greetings,
Christoph Anton Mitterer.

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