This Matrox graphics card is one option for you if you're upgrading your computer. The memory of the card amounts to 1 GB and is of the DDR2 type.
From Quzo
Matrox M9138-E1024LAF. Discrete graphics card memory: 1 GB Graphics card memory type: GDDR2 Memory bus: 128 bit. Maximum resolution: 2560 x 1600 pixels. OpenGL version: 2.0. Interface type: PCI Express x16. Cooling type: Passive
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matrox m9138 1g lp pcie x16 dp m9138-e1024laf - na01
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Matrox M9138 Low Profile Graphics Card - 1GB