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Let me be clear - no motherboard I'm aware of supports using both DDR and PC133 SDRAM at the same time - some boards may have slots for both, but you can't use both at the same time. &nbsp;These are two different types of memory with two different kinds of slots - you won't be able to use the old PC133 in the new DDR system unless the new DDR system also has PC133 slots (which today, is increasingly unlikely).
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Let me be clear - no motherboard I'm aware of supports using both DDR and PC133 SDRAM at the same time - some boards may have slots for both, but you can't use both at the same time.  These are two different types of memory with two different kinds of slots - you won't be able to use the old PC133 in the new DDR system unless the new DDR system also has PC133 slots (which today, is increasingly unlikely).

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@leew, I did have a board that a client purchased about 3-4 years ago...it had 4 &quot;Tritieary?&quot; IDE interfaces so that you can put 8 IDE drives directly on the motherboard..and it had DDR &amp;&nbsp;PC133 slots and you can have them both work...What would happen is that you get the extra RAM, but the speed is a fast as the slowest link. &nbsp;go figure.<br />
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&quot;bleeding edge useless technology&quot;<br />
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I forgot the manufacturer (ching-chiang-ding-dong) some country where you eat noodles.
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@leew, I did have a board that a client purchased about 3-4 years ago...it had 4 "Tritieary?" IDE interfaces so that you can put 8 IDE drives directly on the motherboard..and it had DDR & PC133 slots and you can have them both work...What would happen is that you get the extra RAM, but the speed is a fast as the slowest link.  go figure.

"bleeding edge useless technology"

I forgot the manufacturer (ching-chiang-ding-dong) some country where you eat noodles.

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Leew, I see what you mean. I looked at my new mother board and the PC133 memory will not even fit into the slots.
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Leew, I see what you mean. I looked at my new mother board and the PC133 memory will not even fit into the slots.

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I bought a new mother board. It came with 512MB of UTL30215 PC3200 DDR 400Mhz memory. My old mother board had a 512MBQ8 PC133U-333-542-Z memory stick.<br />
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Can I mix the two?
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I bought a new mother board. It came with 512MB of UTL30215 PC3200 DDR 400Mhz memory. My old mother board had a 512MBQ8 PC133U-333-542-Z memory stick.

Can I mix the two?

PC133 along with PC3200

A desktop computer is a personal computer designed for use at a single location due to its size and power requirements, usually by one person. The most common configuration has a case that houses the power supply, motherboard, disk storage (usually one or more hard disk drives and optical disc drives); a keyboard and mouse for input; and computer monitor and printer for output. The case may be oriented horizontally and placed atop a desk or vertically and placed underneath or beside a desk.