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CPU Frequency vs. NB to SB Frequency

post #1 of 9
Thread Starter 
Hello all,

I'm very near the point of attempting my first overclock, but I need to clear up an issue in my BIOS first. I have an ASUS M2N32 SLI-Deluxe Wireless Edition n590 board found here. My first question deals with the difference between the CPU Frequency option and the Northbridge to Southbridge HT Frequency. Below are my options in two submenues of the BIOS. Bold items are my current settings.

The following options are found in Advanced > JumperFree Configuration:
AI Tuning [Manual, Auto, Standard, AI Overclock, AI N.O.S.]
with Manual selected, the following options open up:
CPU Frequency [Auto, 200, 201, 202, ..., 400]
PCI EX16_1 Clock [stuff]
PCI EX16_2 Clock [stuff]
DDR2 Voltage Controls [stuff]
CPU Vcore Voltage [stuff]
CPU Multiplier [5x, 6x, ..., 11x]

The following options are found in Advanced > Chipset
NB to SB HT Frequency [Auto, 200, 201, 202, ..., 400]
CPU <-> NB HT Speed [Auto, 1xCPU Frequency, 2x, ..., 5x]
NB --> SB HT Speed [1xNB to SB Frequency, 2x, ..., 5x]
SB --> NB HT Speed [1xSB to NB HT Frequency, 2x, ..., 5x]

So the options in Advanced > JumperFree Configuration > CPU Frequency are the same as Advanced > Chipset > NB to SB HT Frequency. Do they both need to be set to the same value as I overclock the "FSB", or should I set the NB to SB HT Frequency to Auto and just adjust the CPU Frequency? This is news to me that you can set the two independently of each other (but I am a noob). I thought the CPU Frequency setting applied to all parts of the motherboard.

And while I have all you experts looking at this part of my BIOS, time for question 2 I know the basics of the HT speed, and that you want it to be close to 1000MHz in most situations (though many AM2 boards like it even higher, like 1200-1400 MHz). But I appear to have 3 settings for this as seen above. The NB --> SB and SB --> NB default at 5x, and don't even have an Auto option. But the CPU <-> NB defaults at Auto, and has the 1x - 5x options as well. Should these all agree? Or, should NB --> SB and SB --> NB agree, with CPU <-> NB set at Auto?

As you can see, my understanding of the CPU's relation to the NB and SB is a little lacking so please take that into consideration when writing your responses. Thanks in advance for your responses. And yes I've read the manual, all it does is state the options, no explanation of what the options do other than restating the title.
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post #2 of 9
Honestly, I left that all on auto/200 as far as the southbridge/northbridge is concerned. It never really affected anything to my knowledge.
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post #3 of 9
Thread Starter 
So you think adjusting ONLY the CPU Frequency option and NOT the NB to SB HT Frequency is all I need to do to overclock? What about the CPU <-> NB HT Speed option? Should that be adjusted if I adjust the other two options below it?
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post #4 of 9
Exactly. Only mess with the cpu to northbridge settings. Leave the others on their stock settings no matter what else you do. I've messed with them a few times and succeeded only in having to clear CMOS to fix it. I've not touched them since.
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post #5 of 9
If you start OC'ing, you will need to lower the HTT freq multi from 5x, down to 3 or 4 to have a stable OC. Ramping up the speed, when FSB is high makes for an un-stable mobo, as chipset freqs will be off the charts.

Cooling the NB with a fan can help too, but most of the time you will find yourself using a 3x HTT multi, if your FSB is above 900mhz...
post #6 of 9
Thread Starter 
Ok so I think I got this down. If I understand you guys correctly, then I am to ONLY adjust the Advanced > JumperFree Configuration > CPU Frequency to increase the FSB and the ONLY option in Advanced > Chipset that I should adjust is the CPU <-> NB HT Speed. And the CPU <-> NB HT Speed should be set to 5x initially, not AUTO, and maybe lowered to 4x if the board becomes unstable in an attempt to make the HT Speed closer to 1000 MHz. If any part of that is incorrect plz let me know, if not, thanks for the responses
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post #7 of 9
Right on bud. Give it your best shot.
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post #8 of 9
sounds good to go! Lemme see some pics of the new OC!
post #9 of 9
--------[ EVEREST Ultimate Edition ]------------------------------------------------------------------------------------
http://valid.canardpc.com/show_oc.php?id=943362
Version EVEREST v5.30.1900
Benchmark Module 2.4.273.0
Homepage http://www.lavalys.com/
Report Type Quick Report
Computer CSOSTAND
Generator Sostand
Operating System Microsoft Windows 7 Ultimate 6.1.7600 (Win7 RTM)
Date 2002-01-01
Time 01:51


--------[ CPU ]---------------------------------------------------------------------------------------------------------

CPU Properties:
CPU Type DualCore AMD Phenom II X2 545, 3600 MHz (15 x 240)
CPU Alias Callisto
CPU Stepping RB-C2
Instruction Set x86, x86-64, MMX, 3DNow!, SSE, SSE2, SSE3, SSE4A
Original Clock 3000 MHz
Min / Max CPU Multiplier 5x / 15x
Engineering Sample No
L1 Code Cache 64 KB per core
L1 Data Cache 64 KB per core
L2 Cache 512 KB per core (On-Die, ECC, Full-Speed)
L3 Cache 6 MB (On-Die, ECC, NB-Speed)

Multi CPU:
CPU #1 AMD Phenom(tm) II X2 545 Processor, 3600 MHz
CPU #2 AMD Phenom(tm) II X2 545 Processor, 3600 MHz

CPU Manufacturer:
Company Name Advanced Micro Devices, Inc.
Product Information http://www.amd.com/us-en/Processors/...30_118,00.html

CPU Utilization:
CPU #1 / Core #1 0 %
CPU #1 / Core #2 0 %
Cpu Temp 37c

--------[ Motherboard ]-------------------------------------------------------------------------------------------------

Motherboard Properties:
Motherboard ID 64-0404-000001-00101111-112709-RS760_SB710$A1459001_BIOS DATE: 11/27/09 16:02:50 VER: 04.04
Motherboard Name ASUS M4A78L-M

Front Side Bus Properties:
Bus Type AMD K10
Real Clock 240 MHz
Effective Clock 240 MHz
HyperTransport Clock 4x 960 MHz
North Bridge Clock 960 MHz

Memory Bus Properties:
Bus Type Unganged Dual DDR2 SDRAM
Bus Width 128-bit
DRAM:FSB Ratio 1:1
Real Clock 240 MHz (DDR)
Effective Clock 480 MHz
Bandwidth 7680 MB/s

One thing i know i need better memory this memory i have is not so good

Memory set at 200Mhz

[ DIMM1/2: Avant Tech. (2 GB DDR2-667 DDR2 SDRAM) ]

Memory Module Properties:
Module Name Avant Tech.
Serial Number None
Module Size 2 GB (2 ranks, 8 banks)
Module Type Unbuffered DIMM
Memory Type DDR2 SDRAM
Memory Speed DDR2-667 (333 MHz)
Module Width 64 bit
Module Voltage SSTL 1.8
Error Detection Method None
Refresh Rate Reduced (7.8 us), Self-Refresh

Memory Timings:
@ 333 MHz 5-5-5-15 (CL-RCD-RP-RAS) / 20-43-3-5-3-3 (RC-RFC-RRD-WR-WTR-RTP)
@ 266 MHz 4-4-4-12 (CL-RCD-RP-RAS) / 16-34-2-4-2-2 (RC-RFC-RRD-WR-WTR-RTP)
@ 200 MHz 3-3-3-9 (CL-RCD-RP-RAS) / 12-26-2-3-2-2 (RC-RFC-RRD-WR-WTR-RTP)

Memory Module Features:
Analysis Probe Not Present
FET Switch External Disabled
Weak Driver Supported

[ DIMM2: Avant Tech. (2 GB DDR2-667 DDR2 SDRAM) ]

Memory Module Properties:
Module Name Avant Tech.
Serial Number None
Module Size 2 GB (2 ranks, 8 banks)
Module Type Unbuffered DIMM
Memory Type DDR2 SDRAM
Memory Speed DDR2-667 (333 MHz)
Module Width 64 bit
Module Voltage SSTL 1.8
Error Detection Method None
Refresh Rate Reduced (7.8 us), Self-Refresh

Memory Timings:
@ 333 MHz 5-5-5-15 (CL-RCD-RP-RAS) / 20-43-3-5-3-3 (RC-RFC-RRD-WR-WTR-RTP)
@ 266 MHz 4-4-4-12 (CL-RCD-RP-RAS) / 16-34-2-4-2-2 (RC-RFC-RRD-WR-WTR-RTP)
@ 200 MHz 3-3-3-9 (CL-RCD-RP-RAS) / 12-26-2-3-2-2 (RC-RFC-RRD-WR-WTR-RTP)

Memory Module Features:
Analysis Probe Not Present
FET Switch External Disabled
Weak Driver Supported

If you see anything that not correct here please let me know

Did more test and found out that HyperTransport Clock 5x 1170 MHz
made it rock solid.....no crash no blue screen all stress test done also
PCMark Vantage x64

The Trick to AMD is a Balance is the result of a number of body systems working together = Stable
Edited by SonyDSLR - 1/12/10 at 12:49pm
Black Edition 955
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