Thinking of getting rid of My RDRAM and mobo for a DDR solution

I am thinking about getting rid of the RDRAM and going with DDR. I have a couple of questions.

How much of a differnce am I really going to see(playing games, surfing the net, playing DVD's, etc.)

What is the best chipset available for DDR right now. I have heard good things about the SiS 645DX.

I will be getting 512Mb of Corsair XMS PC3200 if I decide to go the DDR route.

Also was thinking about these mobos; ASUS P4S533, ABIT SA7,and open to anyother suggestions.

I am not decided if I am going to go that route. Its just a thought I am throwing around in my head right now.

Very little difference in actual use.
You get a much bigger sandra mem score with rdram but a much smaller increase in game frame rates.

If you are going to use a 2.26b cpu in a ddr board and overclock it you probably are not going to want to use a sis chipset board because they have no pci/agp bus lock. They are fine with 1.8a-2.4a's but you can run pretty high fsb's with the B series chips when overclocking.
I would look into a abit BD7-II for that cpu.

The I850e boards that are out now are not very good for overclocking the 2.26b cpu either they have max fsbs of 150-156.

I am just wondering how my TH7II will hold up with the high fsb. I am really worried about my Rambus holding me back.

Some say the board is not very stable at high fsb's.
I have never owned one so that is just what I have heard.
Ask in the abit board section.

Here is my ddr boards cache-memory bench.

I would recommend not getting the SiS chipsets. I saw benchies of DDR scores, the SiS board totally sucked in it.

They are ok depends what fsb you run and how high your memory can go.
Can you get this at 139fsb on a 845g? Sandra shows 140 but wcpuid shows 139.05.
Every review I have seen where the sis645 is used as a comparison they use the memory at 2700 and not 3200 like the chipset allows.