if I use a DDR3 graphics card with DDR3 motherboard then it will work same if I will use a DDR5 graphics card with a DDR3 motherboard, which will work faster with DDR3 motherboard.
DDR3 has nothing to do with GDDR3. They refer to the motherboard's RAM type and GPU's memory type respectively. Both GDDR3 and GDDR5 will work with a DDR3 mobo, which is faster depends on the models you are comparing.
DDR3 has nothing to do with GDDR3. They refer to the motherboard's RAM type and GPU's memory type respectively. Both GDDR3 and GDDR5 will work with a DDR3 mobo, which is faster depends on the models you are comparing.