Intel Communities: Message List

Re: DQ45CB – BIOS 0115 - Lost internal + external video configuration support

webadmin@intel.com — Wed, 30 Mar 2011 03:14:51 GMT

Apparently this issue is due to the fact that there aren't enough PCI-E lanes on the board itself. Only enough for 1 16x device, so when you plug in a discrete card a multiplexer flips off the IGD. I had the same problem thinking I could enable both at once...

Although, REALLY, both gpus should fall back to using 8x lanes but I guess whoever designed this thing didn't consider that so with each gpu it's all or nothing.

Re: DQ45CB Board, memory timing and memory reported strangeness.

webadmin@intel.com — Wed, 30 Mar 2011 03:03:16 GMT

I'm having this same problem, on bios version 0129.

Glad to find out I can regain that lost gb by switching back to auto. (not that I was tweaking voltages or anything, just setting it from the detected 5-5-5-18 timing to the ram's ACTUAL 5-5-5-13 timing).

I must say I'm quite bewildered by this product. SO many features, most of them very nice and rare.. but so many silly problems with the bios it's almost not worth it

Re: DQ45CB switch on..switch off in 10 second continuous cycles

webadmin@intel.com — Wed, 30 Mar 2011 02:58:39 GMT

I was experiencing this same issue and DOA'd 2 boards before I realized it was a case of this particular mobo being VERY touchy about certain rails' voltage levels coming from the PSU.

I managed to work around it by loading the PSU (with hard drives). With 4 drives in the box it boots fine every time and hasn't skipped a beat. As soon as I reduce the load to the motherboard itself, it fails.

I suspect cheap parts in the power circuits (huge liquid caps? who uses those any more?)

DQ45CB - OS unable to access all the RAM

webadmin@intel.com — Wed, 30 Mar 2011 02:28:59 GMT

Heyas,

I've just bought a dq45cb and put 3x 2048mb ram sticks into it. The bios (v0129, latest) sees all 6gb but the OS can only see 5gb of it. I've tried different linux kernels ranging from 2.6.24 to 2.6.38, Windows7, and various livecd distros and they all report the same thing.

The IGD is using 256mb presently but this doesn't account for the other 768mb lost to the aether. I've also tried with the IGD disabled and using a PEG card in the 16x slot, no difference. I've tested the ram in other boards and run memtest86 on them overnight.. they're all fine. I've checked the ram timings reported by the bios and they're fine too.

What's happened to that other 1gb??

As I want to use this machine for virtualization (I bought it because it has VT-d/iommu) this missing 1gb is quite a big constraint.