Article AMD Phenom II x4 Northbridge OC

Jimboss99

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Jun 2, 2016
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Hello everyone,
I am writing this article to test the benefits of increasing the CPU Northbridge frequency for the AMD Phenom II x4. This was just a simple synthetic test I carried out using Cinebench R15.
The Northbridge connects the CPU, ram and for this and other Denib processors l3 cache.
I read that increasing the Northbridge frequency for these chips affects gaming benchmarks more than synthetic benchmarks as this increases the speed of the l3 shared cache (beneficial for gaming) as well as the ram speed. But there is a difference in this synthetic test as you'll see.
The only thing I change is the NB frequency (and voltage) everything else is kept the same to make it a fair test (Bus speed left at 200MHz, cpu at 3.6GHz, HT at 2000MHz, RAM etc.)
I'll keep the details brief as this is a short test:

Setup:
Motherboard: M4A88T-m
CPU: Phenom II x4 965 BE 125w (C3 stepping) @ 3.6GHz 1.4V
RAM: 4x4GB Kingston cl9 1333 1.5V (running at 1066MHz cl7)

BIOS settings (2400MHz NB):

Bios settings (2000MHz NB):
Same except:
CPU/NB Frequency: 10.00x
VDDNB Over Voltage: Auto


TESTING (CINEBENCH R15 SCORES):
I run the benchmark 4 times for NB at 2000MHz and at 2400MHz, then I re-test:

NB 2000MHz:
356
357
357
359

NB 2400MHz:
361
362
360
360


NB 2000MHz Re-Test:
356
358
358
358

NB 2400MHz Re-Test:
361
361
364
364

Combined average (2000MHz NB, 2400MHz NB):
357.375
361.625


There you have it. A slight improvement for the synthetic benchmarks when increasing the NB from 2000MHz to 2400MHz for the same CPU Frequency!
I expect better performance increase in games which I may test at a later date.

Thanks for reading!

NOTE: If any information I have given is wrong, please correct me!
 
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