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RAM not recognized

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October 25, 2010 2:48:27 AM

Ok I have a couple of questions relating to some issues I'm having with a new RAM kit I just put in my rig (CORSAIR DOMINATOR 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600). Know that this was the first pc I built myself and have very little experience working with the BIOS.

Intel i7 930
Gigabyte GA-X58A-UD3R
XFX Radeon HD 5870
Corsair Dominator 6GB DDR3 1600
Intel 80GB X25M Boot WD 1TB Caviar Black Data
Corsair 750TX PSU
Win 7 64bit
HAF X

First of all there seems to be a problem with all 3 sticks being recognized, If I go into the control panel to view the amount of ram I see 6.0 GB (4.0 GB Usable). In the BIOS it shows the amount of RAM as only 4096MB but it also lists A, B, and C channels to change timings and turnaround, so it looks like all 3 sticks are recognized but only 2 are being used?

I haven't made any changes in the BIOS concerning the RAM, is there anything I need to do? For example ram is spec'd at 1.65 volts but the i7 wants ram at 1.5, do I need to change anything with respect to that? BIOS shows DRAM at 1.5V. Sorry for being noobish, trying to learn.

Thanks

More about : ram recognized

a b B Homebuilt system
October 25, 2010 6:33:36 AM

I'm not familiar with the BIOS, but there may be a setting to select triple or dual channel. Otherwise, try each stick individually, as this will either find your issue or rule our the RAM as the problem.
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a c 113 B Homebuilt system
October 25, 2010 6:47:41 AM

Yes. However, I think there could also be a chance of a mis-matched stick that needs different settings to run, but is otherwise OK.

You could run CPU-Z and check the SPD tab for each RAM stick, see if it lists any discrepancies.
http://www.cpuid.com/cpuz.php

Someone else was having this issue the other day, with only one stick showing. Make sure your BIOS settings match the timings and voltage for the RAM also.
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Related resources
October 25, 2010 2:43:33 PM

OK, I ran CPU-Z, under the "Memory" tab, it lists the Size as 6144 MB, but "Channels #" as dual, so that doesnt seem right, not sure how I would go about changing that to triple though. Also (and sorry for the forthcoming wall of text) but here is the SPD results from the test:

Memory SPD
-------------------------------------------------------------------------

DIMM # 1
SMBus address 0x50
Memory type DDR3
Module format UDIMM
Manufacturer (ID) Corsair (7F7F9E0000000000)
Size 2048 MBytes
Max bandwidth PC3-10700H (667 MHz)
Part number CM3X2G1600C8D
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-16-23 @ 444 MHz
JEDEC #2 8.0-8-8-22-30 @ 592 MHz
JEDEC #3 9.0-9-9-24-34 @ 666 MHz
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.650 Volts
Min Cycle time 1.250 ns (800 MHz)
Min tRP 10.00 ns
Min tRCD 10.00 ns
Min tWR 15.00 ns
Min tRAS 30.00 ns
Min tRC 50.63 ns
Min tRFC 110.00 ns
Min tRTP 7.50 ns
Min tRRD 7.50 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 6.0-6-6-18-31-2T @ 600 MHz (1.650 Volts)
XMP #2 8.0-8-8-24-41-2T @ 800 MHz (1.650 Volts)

DIMM # 2
SMBus address 0x52
Memory type DDR3
Module format UDIMM
Manufacturer (ID) Corsair (7F7F9E0000000000)
Size 2048 MBytes
Max bandwidth PC3-10700H (667 MHz)
Part number CM3X2G1600C8D
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-16-23 @ 444 MHz
JEDEC #2 8.0-8-8-22-30 @ 592 MHz
JEDEC #3 9.0-9-9-24-34 @ 666 MHz
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.650 Volts
Min Cycle time 1.250 ns (800 MHz)
Min tRP 10.00 ns
Min tRCD 10.00 ns
Min tWR 15.00 ns
Min tRAS 30.00 ns
Min tRC 50.63 ns
Min tRFC 110.00 ns
Min tRTP 7.50 ns
Min tRRD 7.50 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 6.0-6-6-18-31-2T @ 600 MHz (1.650 Volts)
XMP #2 8.0-8-8-24-41-2T @ 800 MHz (1.650 Volts)

DIMM # 3
SMBus address 0x54
Memory type DDR3
Module format UDIMM
Manufacturer (ID) Corsair (7F7F9E0000000000)
Size 2048 MBytes
Max bandwidth PC3-10700H (667 MHz)
Part number CM3X2G1600C8D
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-16-23 @ 444 MHz
JEDEC #2 8.0-8-8-22-30 @ 592 MHz
JEDEC #3 9.0-9-9-24-34 @ 666 MHz
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.650 Volts
Min Cycle time 1.250 ns (800 MHz)
Min tRP 10.00 ns
Min tRCD 10.00 ns
Min tWR 15.00 ns
Min tRAS 30.00 ns
Min tRC 50.63 ns
Min tRFC 110.00 ns
Min tRTP 7.50 ns
Min tRRD 7.50 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 6.0-6-6-18-31-2T @ 600 MHz (1.650 Volts)
XMP #2 8.0-8-8-24-41-2T @ 800 MHz (1.650 Volts)
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a c 113 B Homebuilt system
October 25, 2010 7:00:22 PM

They seem identical.

From your manual:

"When enabling 3 Channel mode with three memory modules, be sure to install them in the DDR3_1, DDR3_2 and DDR3_4 sockets. "

That is slots 1, 2, and 4
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October 25, 2010 10:15:21 PM

What manual are you talking about? From the mobo manual it says slots 1, 3, and 5, which is what I have set up now.

Also, I just re-ran CPU-Z it now says Channels # as Triple, tho windows still says only 4 GB usable and only 4 listed in BIOS
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Best solution

a c 113 B Homebuilt system
October 26, 2010 12:45:52 AM

Ooops wrong manual. I had one of the earlier versions with 4 total slots.

Yes you need 1, 3, and 5. And just to be sure, you looked closely at the diagram, right? When counting inside-out, starting with the slot nearest the CPU, the slots go 2,1 4,3 6,5. So if a sane person had numbered the slots you would be (properly) populating 2,4, and 6.

In other words, it's the three white slots.. at least if we are talking about the current (10/25/2010) version being sold.

If the BIOS still says there's only 4GB, and you have swapped them around to verify that all three sticks are recognized by the BIOS, then you might try flashing the BIOS to version FB (if it's not already).

If that doesn't work then I have to think it's either the board (as in the 3rd physical RAM slot is defective), or the memory controller on the CPU (but that's going to be very rare indeed).
Share
October 26, 2010 1:16:52 AM

Yes, I'm sure the right slots are occupied. I guess I will try swapping RAM around and then flashing if that doesnt work, but that probably won't happen until this weekend (busy week, stupid engineering classes)
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a c 113 B Homebuilt system
October 26, 2010 1:25:06 AM

Sounds like the plan then! let us know.
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October 26, 2010 1:45:03 AM

Will do, thanks for the help so far!
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October 30, 2010 2:10:51 AM

Ok well I simply swapped the individual sticks around to different slots and I now have all 6GB recognized in the BIOS and by windows, so it seems everything is ok now. Thanks for the help!
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October 30, 2010 2:11:11 AM

Best answer selected by Sneaky Jedi.
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a c 113 B Homebuilt system
October 30, 2010 6:18:59 AM

sneaky jedi said:
Ok well I simply swapped the individual sticks around to different slots and I now have all 6GB recognized in the BIOS and by windows, so it seems everything is ok now. Thanks for the help!


Could have been a bad contact or some minor incompatibility. Maybe one of the modules needed just a hair more voltage than slot 5 could provide... who knows. Glad it's resolved :) 
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