Because if it's not, it should be!
I'm trying to get 2 x 1GB PC2700 ECC Registered DDR333 DIMMs (Micron brand) to work in my computer, but it won't POST: the computer starts, fans and hard drive spin up, but the monitors don't power up.
- Motherboard: Supermicro X5-DAE, E7505 chipset
- CPU: (2) Xeon 2.4 GHz
- BIOS: 1.3b, the latest
The X5DAE/X5DA8 supports up to 12 GB of ECC registered DDR-266/200 (PC2100/1600) memory.
but manufacturers are usually conservative.
So here's the Q: Is it supposed to work? Can I prep the BIOS beforehand, change some timings or something, or is this type of thing just a no-go in ECC land?
If you can find an example of others using PC2700 with this board let me know.
Update: I removed all cards, USB devices, cables and swapped the AGP video card out with a known good PCI just to mix things up.
Computer gives 1 beep on startup, which is normal. No other beep codes. Monitor still blank. I've tried the PC2700 pair in all 3 banks, no change. My good RAM is 2 x 512MB PC2100 ECC Crucial brand and works in all 3 banks. I tried putting the PC2100 in bank 1 and PC2700 in bank 2 hoping bank 1 would force everything to PC2100. Still nothing. Anything else I miss?
This has been resolved with the vendor as a high density memory incompatibility issue. Ebay has some literature on it:
JEDEC standard/guideline specifies that 64Mx8 and 32Mx16 devices are to be used to construct a 1GB Unbuffered module. Any 1GB Unbuffered module constructed by using 128Mx4 device BREAKS all the JEDEC standard/guideline in which is supposed to be designed only for Registered module. Since JEDEC doesn't want the modules to be built that way, so the companies who make them (a lot are generic and 3rd parties), don't put their company label on the Unbuffered modules.