Answer:Please refer to page 17 of user's manual.
http://download.asrock.com/manual/ConRoe1333-DVIH%20R2.0.pdf
Recommended Memory Configurations (DS: Double Side, SS: Single Side)
| DDRII_1 (Yellow Slot) | DDRII_2 (Orange Slot) | DDRII_3 (Yellow Slot) | DDRII_1 (Orange Slot) |
| 1 memory module | DS/SS* | x | x | x |
| 2 memory modules | DS/SS | x | DS/SS | x |
| 2 memory modules | x | DS/SS | x | DS/SS |
| 3 memory modules | SS | SS | DS/SS | x |
| 4 memory modules | SS | SS | SS | SS |
* If you only install one memory module, you can install it to any one of the four slots.
These two TRANSCEND memory modules can only be supported under the following conditions:
| DRAM VENDOR | SIZE (MB) | TYPE | CELL VENDOR | CELL NO. | SINGLE SIDE / DOUBLE SIDE |
| TRANSCEND | 256 | DDRII533 | SAMSUNG | K4T56083QF-ZCD5 | SINGLE SIDE |
| TRANSCEND | 512 | DDRII533 | INFINEON | HYB18T512800AF37 | SINGLE SIDE |
1. If you plan to install one above memory module, you can install it to any DDRII slot of this motherboard.
2. If you plan to install two above memory modules, it is recommended to install them either in the set of yellow slots (DDRII_1 and DDRII_3), or in the set of orange slots (DDRII_2 and DDRII_4).
3. This motherboard does not support three or four above memory modules.
