I had the same problem yesterday (12/11/2009) with virtually the same configuration, and I'm using Kingston's KVR1333D3N9/2G X 2 (for a total of 4 Gigabytes of RAM) so I don´t think is a "brand problem"; I have built at least 500 PCs by myself and this is the first time it won't start normally... and everything was done by the book.
I'm starting to thing this is a Motherboard issue...
Well... I was able to make it work: I populated the third and fourth memory slots (the pair farther away from the processor) and got to pass the memory error. I know it sounds wrong, since the instructions clearly state that "Channel A, Dimm 0 must be populated" but trust me, it worked.
I already installed Windows 7 and most of the software I use and had no troubles so far; I dared to update the BIOS and try to populate the memory slots as suggested, but the error persisted, so I had to move them back to their original position.
One interesting thing though: All the SATA ports changed places; this leads me to think that something is wrong about the memory slots two, but hasn't been addressed yet. We'll have to wait and see I guess.
Hope this will help!
I just recently bought the same Intel DP55WG board with an intel i7-860 and I just had the same thing happen to me with Brand new G-Skill DDR3-1333 4x2GB ram. The only way I could make it work was to use Channel B Dimm 0 and 1 to make it 4GB and leaving out the other 2 sticks. Anyone gotten around for a fix for this or is it a bad board? I even tried disconnecting all drives thinking it was related to not enough juice and still get error 21. I upgraded the bios and now instead of giving error 21 it just turns right off if the Channel A Dimm 0 or 1 is used.
got exactly the same problem but could not get the system to boot at all. tried all the slots with 1 or 2 modules in different configs but it just wouldn't pass the post. I used i7 860 processor, 2x2048 kingston modules, sparkle 250gts graphics, 1 x seagate 300Gb disk, 1 x western digital 160Gb disk and TV tuner card, PSU is Powerman 550w.
I had the same issue. Intel DP55WG, newest BIOS, certified Kingston memory with 4 x 4GB brought up post code 21 and the machine booted in a loop. Kingston support said memory or mainboard seems to be defect.
However Post code 21 doesn't have to be defective mainboard or defective RAM. I did not overclock the mainboard but just resetting the BIOS to optimal defaults worked fine for me. I could run successfully a memory test after with having any more errors.
16GB: Kingston Part# KVR1333D3N9K2/8G x 2
8GB: OCZ Part# OCZ3P1600LV4GK x 2
Hope this helps
Greetings from Germany
Guys, I'm really battling too.
DP55WG with i5-750
2 x 4GB Kingston KVR1333D3D4R9S/4GI
3 x HD of various sizes
1 HP SATA DVD 1260i
Never managed to get to the stage of loading my 64bit Win7 as I can never get past the POST 21 and triple beep. Tried one x 4GB RAM in all of the slots but no joy (tried the other one too in each slot of course)
Two things that I'm wondering about. First, my RAM is 10600 parity - but surely the board can cope with that? It's still 1333 after all.
I know that the gigabyte board GA-P55M-UD2 (which uses the same chipset I understand) has very similar problems. One of their suggestions involved a change in power supply. Anyone know about that as a potential issue?
Any help would be really appreciated. I'm an older returning student and this problem has turned into a time vacuum! Additionally, my online supplier will not take any of the parts back - including the RAM, so $$ a bit of an issue. A few years ago I used to build these things for a living so I really ought to be able to make this work.
Thanks in desperation!
i also got the same error.
well my PC specs are
Processor: intel Core i7 860 2.88 Ghz
Memory: Corsair 6 GB (3 X 2GB)
Graphics Card: xfx ati radeon 5750
PSU : Cooler Master 600 watt
Well when i inserted only 2 stick (4 GB) its working fine, but when i inserted one more stick its start beeping and display 21 post code error.I updated the BIOS and also changed the slot, but still have the same issue.
do you have any solution regarding the said issue.
So, I had this issue also.... turns out I didn't read the manual closely enough. It clearly shows on page 17 that Channel A, DIMM 0 is the blue slot that is closer to the processor. It also states that Channel A DIMM 0 must be populated in order to boot. If using 2 sticks of RAM, you have to populate both DIMM 0 slots (i.e. one in channel A and the other in channel B). One of the techs pointed this out to me during a live chat. It's confusing because previous boards had the blue slots closer to the processor, whereas this board has the black slot (DIMM 1) next to the processor. Anyway, once I fixed that it booted!
I should note that it's Intel tech support that keeps me buying Intel Motherboards. A 10-minute chat and problem solved!
Thank you for your suggestion. I have just bought 2x2GB Kingston KVR1333D3N9/2G (which are specifically on the tested list). Took out my 2x4GB and replaced them with the new 2x2GB in the DIMM 0 slots. Computer turned on for the first time, painless load of Win 7 64-bit (typing this on the resuscitated machine).
I updated the BIOS and then tried putting in my 2x4GB (Kingston KVR1333D3D4R9S/4GI) into the DIMM 1 slots (total now 12GB in 2x2GB and 2x4GB).
Error 21. Tried just the 2x4GB in DIMM 0, tried swapping every way I could think of. Error 21 every time until I went back to just 2x2GB.
I have read that some people have had luck with upping the memory voltage, so I cranked it all the way up to 1.6V (in 0.02V increments). Error 21 every time. Put the memory voltage back to auto.
I’m really not that sure the board can support anything more than 2GB DIMMs. I can’t believe that I have an incompatibility between the memories, they are both Kingston PC3-10600 REG CL9 240 pin. The only difference is that one is 2GB / slot, the other 4GB.
Anyway, I’ll fire this off to tech support, see if they can give me any more ideas.