Not all MX cards are created equal. Some have a 128 wide bus with
SDRAM (128 bits of info on each clock edge) or
a 64 bit DDR (highway half as wide as 128 but cars are
double deckered). To complicate matters,
Nvidia quotes the effective SDR rate even
for DDR products. So their 175/360 DDR designation is equivalents
to ATI's 175/180 DDR designation. ATI's designation is
in line, while Nvidia's is something made up by Nvidia's marketing
department using the philosopy that bigger number is better.
This is from a Anandtech review:
By halving the memory bus width and doubling the amount of data that can travel
along this bus in a cycle, the 64-bit DDR GeForce2 MX based cards should end
up performing identical to the 128-bit SDR MX cards. Indeed, both types of
cards feature the same memory bandwidth of 2.7 GB/s. The truth of the matter is
that we may see the 128-bit SDR cards performing slightly faster than the
64-bit DDR cards due to the fact that SDR memory is theoretically more efficient
than DDR memory.
So why use a 64-bit DDR configuration in a GeForce2 MX based product. Well,
first off, this setup may prove to be slightly cheaper to produce when compared
to the 128-bit SDR cards. It is true that DDR memory is more pricey than SDR
memory, however the money spent using DDR memory is money saved when
producing only a 64-bit wide memory bus. Since the smaller the width of the
memory bus, the less internal traces are necessary in the board, production
costs are decreased. The second reason for using DDR memory its marketing
value. As we mentioned above, users who see the letters DDR equate this to
higher performance. If two cards were placed on a store shelf next to one
another, one boasting DDR memory and the other using SDR memory, the vast
majority of users would pick the "faster" DDR product giving the two are the same
price.
It took a retail salesman at Futureshop on a slow afternoon
to explain all of this to me. I read a
MX review at Anandtech that explains a lot of this.
I did not find the Anandtech review to be representative of my experience
with the MX card at the store but found it to more in line
with a review linked below.
I ended buying a Radeon 32 MB DDR (128 wide and double decker so
that it is equal to a 256 wide SDR running at 183MHz).
The game aspect was more for my son while the 2D is just
magnificient with 17" Sony monitor that I bought at the same time.
If you want to spend a bit less, the SDR are also very good.
Take a look at the
Value Video Roundup.
I have also read that some Radeon users have push the card up to 1920x1440
with good text quality.