Memory bus speed exceeds Chipset speed

Gigabyte Ep43-ds3l intel p43 socket 775...
March 26, 2010 at 11:38:32
Specs: Windows 7 Ultimate
My computer is currently blue screen crashing
extremely regularly and frequently fails to boot,
and according to SiSoftware Sandra:

"Warning 2542 : Memory bus speed exceeds
Chipset rated speed. Reduce FSB/memory

Could someone assist me with correcting the
settings for this please?

I saw a similar topic in this category so hoped
someone might be able to help.


Mainboard : Gigabyte EP43-DS3L
RAM: Corsair 4GB (2x2GB) DDR2
1066MHz/PC2-8500 Dominator Memory Kit
CL5 (5-5-5-15)
BIOS : Award (Phoenix) F9e 09/03/2009
Intel Core2 Quad CPU, Q9650 @ 3.00GHz

Front Side Bus Speed : 4x 333MHz (1.33GHz)
Maximum FSB Speed : 4x 333MHz (1.33GHz)
Memory Bus Speed : 2x 533MHz (1GHz)

Memory Module(s)
Memory Module : Corsair CM2X2048-8500C5D
2GB DIMM DDR2 PC2-8500U DDR2-1066 (5-
5-5-18 3-23-6-3)
Memory Module : Corsair CM2X2048-8500C5D
2GB DIMM DDR2 PC2-8500U DDR2-1066 (5-
5-5-18 3-23-6-3)

Logical/Chipset Memory Banks
Bank 2 : 1GB DIMM DDR2 5-5-5-15 4-20-9-5 2T
Bank 3 : 1GB DIMM DDR2 5-5-5-15 4-20-9-5 2T
Bank 6 : 1GB DIMM DDR2 5-5-5-15 4-20-9-5 2T
Bank 7 : 1GB DIMM DDR2 5-5-5-15 4-20-9-5 2T
Maximum Installable Memory : 8GB
Memory Bus Speed : 2x 533MHz (1GHz)
Maximum Memory Speed : 2x 400MHz
Multiplier : 16/10x

Video System
Video Adapter : NVIDIA GeForce 9800 GT
(112 SM4.0 1.6GHz, 1GB DDR3 2x900MHz,
PCIe 2.00 x16)

Computer Memory Controller
Error Correction Capability : None
Maximum Installable Memory : 4GB
Bank0/1 - A0 : Empty
Bank2/3 - A1 : DIMM 2GB/64 @ 800MHz
Bank4/5 - A2 : Empty
Bank6/7 - A3 : DIMM 2GB/64 @ 800MHz

Memory Module (x2)
Manufacturer : Corsair
Model : CM2X2048-8500C5D
Extended Information : mVN
Type : 2GB DIMM DDR2
Technology : 16x(128Mx8)
Speed : PC2-8500U DDR2-1066
Standard Timings : 5-5-5-18 3-23-6-3
Version : 1.02
Memory DC Line : 1.80V
Timing @ 400MHz : 5-5-5-18 3-23-6-3
Timing @ 270MHz : 4-3-3-12 2-15-4-2
Enhanced Performance Profiles : Yes
Profile @ 533MHz: Optimal : 5-5-5-15 X-22-32-
X 2T 2.1V

See More: Memory bus speed exceeds Chipset speed

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March 26, 2010 at 12:32:24
Don't put 100% faith in SANDRA.

My guess is you simply accepted the BIOS defaults rather than manually configuring the settings. I believe your RAM is spec'd out by the manufacturer (Corsair) to run at 2.1v but according to what you posted, it's running at 1.8v.

Change the voltage to 2.1v & test the RAM with memtest86.

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March 26, 2010 at 12:46:18
Thank you for your reply.

I used memtest86 initially to check for errors and it all came
back fine. I'll have a look at the voltages now..

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March 26, 2010 at 14:12:42
I set the DRAM Voltage to 2.1 and its still crashing
unfortunately. I'm not sure what else to change.

Corsair TWIN2X4096-8500C5D Dominator 4GB 2 X 2GB PC2-8500 1066MHz 240-Pin DDR2 CL5 2.1V Dual Channel Desktop Memory

I've taken an image of bios options I have:

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Related Solutions

March 26, 2010 at 14:25:04
According to your screenshot, the voltage is on AUTO, so it's probably still at 1.8v. In fact, many of the settings are on AUTO. Do you not know how to configure the BIOS?

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March 26, 2010 at 14:28:44
I had set the voltage to 2.1V after taking the picture, so that is changed at the moment, but sadly the machine still blue screens and has trouble (blue screens when) booting.

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March 26, 2010 at 18:11:15
Well, what is the error message on the blue screen?

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March 26, 2010 at 18:41:08
Thank you for your continued feedback :)

There were a few different blue screen errors, a couple related to files in system32 and one mentioned the memory directly, but I haven't noted the errors down yet as I thought the problem might be the bus speed fault that SiSoftware Sandra had given.

I'll get the machine not to reboot straight away on crash and will jot down the error next time.

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March 27, 2010 at 07:16:40
I've now got a few 'driver_irql_not_les_or_equal' blue screen errors, one relating to nvlddmkm.sys

0x000000D1 (0x00000075 0x0000001A 0x00000001 0x94FA0D38)

and an 'A problem has been detected...'

0x0000008E (0xC0000005 0x834464A8 0xA0DB399C 0x00000000)

I tried resetting the bios to default and then the voltage to 2.1V with no effect. The computer continues to regularly BSOD :(

After a quick test, the machine runs fine with some older Crucial Ballistix 2x1GB PC2-5300 DDR2 RAM (BL12864AA663)

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March 27, 2010 at 08:34:54
nvlddmkm.sys is related to the nvidia driver.

0x0000008E indicates a memory problem.

Since the error message indicates a memory problem & the system works with the older RAM, it stands to reason that either the Corsair RAM is bad, or you have the BIOS settings messed up.

How familiar are you with Intel systems? The reason I ask is DDR2-1066 is the wrong RAM to be running with a 1333MHz FSB CPU. You should have DDR2-667. Try underclocking your RAM to DDR2-667 speed.

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March 27, 2010 at 09:11:23
Aah that is interesting; thank you for pointing that out, I hadn't actually looked for incompatibility as I was guaranteed they were sending a match -

The RAM for my computer had failed under warranty but that model had been discontinued, so their product manager approved the Corsair TWIN2X4096-8500C5D as a suitable replacement for my setup and it arrived in the post last week.

I have set (G)MCH Frequency Latch back to Auto, and System Memory Multiplier to 2.00B, and will see how that goes.

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March 28, 2010 at 12:29:49
Thank you ever so much for your assistance jam!!

The machine has not crashed once since making the change :)

Much appreciated!! :)

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