My friend had 125 mb of physical memory and a pentium 2 300 mhz 100 speed module My friend put a pentium 2 450 mhz 65mg speed module in his computer After he did that his physical memory read 64 mb. Is he better off putting his old pentium 2 back At least he had his125 mb of memory back again. Or shouldhe just put a extra 64 ram and keep the new 450 pentium