NeoSeeker has posted a review on the Abit Siluro MX400 Video Card

The core speed of the MX 400 is 25MHz greater than that of the older MX cards. This is fine and dandy, although more or less useless when the memory bandwidth limitations are factored into the equation. If the memory wasn't able to provide enough data to the core when it was running at 175MHz, a core running at 200MHz isn't going to do much better.

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