If they are aftermarket rounded ide cables, they are likely quality ATA100 (UDMA100) cables.
The easiest way to check would be the 'thickness' of the cable. Though, I've been working on computers for well over 10 years now. An 80 pin cable looks almost flat because the pins are so close together, where a 40 pin cable has more obvious ridging between the cables. Plus a 40 pin cable has a standard black/grey end on all 2/3 connectors, where a 80 pin cable has blue, red, or yellow ends.
I would then continue to look at the drivers and windows itself. There are other things in the device manager you could check to ensure that UDMA33 or UDMA66 was enabled on your primary and secondary ports.
One quick check would be here:
+ Control Panel
+ System
+ Hardware (if applicable)
+ Device Manager
+ IDE ATA/ATAPI Controllers
+ <name> Controller
+ Primary / Secondary Channel
Ensure that DMA is selected and enabled if available. Also make sure you don't have any bangs or questions. Curious, what is the controller that you have listed there? We can check for even newer drivers for it...
P.S. Kirill, you're not helping

! *LOL*