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can some one tell me what part of hardware establish if Mac OS X can be used with vanilla kernel on a PC?

i have a working retail Leopard updated to 10.5.8 , using voodoo 9.8.0 kernel.

when i first installed leo on my PC was when iAtkos v1 was out and it worked great and at installation point when you select if you want to use voodoo kernel, i didn't select any, same as with v4.

With v5 and also with v7 i had to select a voodoo kernel so that leo would work on my PC.

At this point i'm still not sure if with v1 and v4 i was using vanilla kernel, and if yes... why didn't it worked with v5 and v7?

i'm asking this because i have a dual core D805, and soon i want to get an i7 920.

on some tutorials of retail leo and snow leo installs, it was mentioned that users with i7 should use god knows what kernel...no vanilla for them, but recently i saw that some user have leo or snow leo working with vanilla kernel on their i7.

basic...the usage of vanilla kernel is determined by cpu or motherboard...or any other component?

also on my pc i have an Ati Radeon x1600pro silent fully working on my leo qe/ci enable, and i am going to change it with an ati hd4870 (saphire)..do i need extra kext to make it work? cause i know that apple from 10.5.7 update (i think...maybe 10.5.8) has included support for ati hd4870.

thank you