I used a radio shack 'helping hands' tool with two clamps for the board and a magnifying glass. Made my own ground strap from a piece of wire. Many iMac overclocks do not work reliably - and delicate soldering is required. Many owners are report they expected 640x480 capture sizes based on an original Dec. 1998 ATI Press Release on the VR128 that noted 'up to' 640x480, 30fps capture rates. For a guide to finding answers to questions - see my Site Guide page.
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