Can only get SDRAM to read at 1/4 of total in this board. Example-128 meg reads 32, 64 reads 16. with both installed, they read 48 at boot up. Simms chips read ok and EDO reads ok. Currently have 128 & 64 SDRAM and 2-16 SIMMS installed. Reads 81 at boot up. What do I need top do so it will read all of memory?