My motherboard is Intel G101GGc with 256 MB shared Video Memory.I want to buy an external graphics card.Which graphics card will fit my motherboard?Please specify model types and maximum size.
Your board has a PCI-E x16 slot. The size will depend on your case; top-end cards are quite long. They also have as many as two auxilliary power connectors on them. What brand and model is your PSU? Does it have a 6-pin PCI-E power connector? If your power supply is small (e.g. 250W-350W), you will be limited on what card you can install, unless you replace that too.
Do you play games? Which ones? If you don't play games, you really have no reason to get anything more powerful than a 4350, which is $35-$40 now. If you play games, the strongest you can get with a weak PSU would be a 4670, which needs no auxilliary power. Those are about $80 now.