Sign in with
Sign up | Sign in
Your question

[Help] Actual CPU speed is lower than rated on retail box

Last response: in CPUs
Share
June 9, 2007 2:38:35 AM

My sis has an Intel Pentium CPU D935 (dual core at 3.2GHz). After installing Everest Ultimate v4, I obtained the following CPU results:

--------[ EVEREST Ultimate Edition v4.00 ]--------------------------------------

Version: EVEREST v4.00.976
Benchmark Module: 2.1.184.0
Homepage: http://www.lavalys.com/
Report Type: Quick Report
Computer: XXXXXXXXX
Generator: XXXXXXXXX
Operating System: Microsoft Windows Vista Ultimate 6.0.6000 (Vista Retail)
Date: 2007-06-09
Time: 01:02

--------[ Overclock ]---------------------------------------------------------------

CPU Properties:
CPU Type: DualCore Intel Pentium D 935
CPU Alias: Presler
CPU Stepping: D0
Engineering Sample: No
CPUID CPU Name: Intel(R) Pentium(R) D CPU 3.20GHz
CPUID Revision: 00000F65h

CPU Speed:
CPU Clock: 2407.2 MHz (original: 3200 MHz)
CPU Multiplier: 12.0x
CPU FSB: 200.6 MHz (original: 200 MHz)
Memory Bus: 401.2 MHz
DRAM:FSB Ratio: 12:6

CPU Cache:
L1 Trace Cache: 12K Instructions per core
L1 Data Cache: 16 KB per core
L2 Cache: 2 MB per core (On-Die, ECC, ATC, Full-Speed)

Motherboard Properties:
Motherboard ID: 64-0401-000001-00101111-030207-Intel-BW$A0724000_BIOS

DATE: 03/02/07 15:34:49 VER: 08.00.12
Motherboard Name: Unknown

Chipset Properties:
Motherboard Chipset: Intel Broadwater P965
Memory Timings: 5-5-5-18 (CL-RCD-RP-RAS)
Command Rate (CR): 2T

SPD Memory Modules:
DIMM1: Kingston KTC1G-UDIMM 1 GB DDR2-800 DDR2 SDRAM (5-5-5-18 @ 400 MHz) (4-4-4-12 @ 266 MHz) (3-3-3-9 @ 200 MHz)
DIMM2: Kingston KTC1G-UDIMM 1 GB DDR2-800 DDR2 SDRAM (5-5-5-18 @ 400 MHz) (4-4-4-12 @ 266 MHz) (3-3-3-9 @ 200 MHz)

BIOS Properties:
System BIOS Date: 03/02/07
Video BIOS Date: 04/16/07
DMI BIOS Version: 0401
================================================

CPU-Z test results:

-------------------------
CPU-Z version 1.40
-------------------------

Processors Map
------------------------------------------------------------------------------------

Number of processors 1
Number of threads 2

Processor 0
-- Core 0
-- Thread 0
-- Core 1
-- Thread 0


Processors Information
------------------------------------------------------------------------------------

Processor 1 (ID = 0)
Number of cores 2
Number of threads 2 (max 2)
Name Intel Pentium D 935
Codename Presler
Specification Intel(R) Pentium(R) D CPU 3.20GHz
Package Socket 775 LGA (platform ID = 2h)
CPUID F.6.5
Extended CPUID F.6
Core Stepping D0
Technology 65 nm
Core Speed 2407.3 MHz (12.0 x 200.6 MHz)
Rated Bus speed 802.4 MHz
Stock frequency 3200 MHz
Instructions sets MMX, SSE, SSE2, SSE3, EM64T
L1 Data cache 2 x 16 KBytes, 8-way set associative, 64-byte line size
Trace cache 2 x 12 Kuops, 8-way set associative
L2 cache 2 x 2048 KBytes, 8-way set associative, 64-byte line size
FID/VID Control yes
FID range 14.0x - 16.0x
VID range 1.116V - 1.276V


Chipset
------------------------------------------------------------------------------

Northbridge Intel P965/G965 rev. C2
Southbridge Intel 82801HB/HR (ICH8/R) rev. 02
Graphic Interface PCI-Express
PCI-E Link Width x16
PCI-E Max Link Width x16
Memory Type DDR2
Memory Size 2048 MBytes
Memory Frequency 401.2 MHz (1:2)
CAS# 5.0
RAS# to CAS# 5
RAS# Precharge 5
Cycle Time (tRAS) 18
Command Rate 2T


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

DIMM #1

General
Memory type DDR2
Manufacturer (ID) Kingston (7F98000000000000)
Size 1024 MBytes
Max bandwidth PC2-6400 (400 MHz)
Part number KTC1G-UDIMM
Serial number A83EF481
Manufacturing date Week 12/Year 07

Attributes
Number of banks 2
Data width 64 bits
Correction None
EPP no

Timings table
Frequency (MHz) 200 266 400
CAS# 3.0 4.0 5.0
RAS# to CAS# delay 3 4 5
RAS# Precharge 3 4 5
TRAS 9 12 18
TRC 12 16 23


DIMM #2

General
Memory type DDR2
Manufacturer (ID) Kingston (7F98000000000000)
Size 1024 MBytes
Max bandwidth PC2-6400 (400 MHz)
Part number KTC1G-UDIMM
Serial number A93EF781
Manufacturing date Week 12/Year 07

Attributes
Number of banks 2
Data width 64 bits
Correction None
EPP no

Timings table
Frequency (MHz) 200 266 400
CAS# 3.0 4.0 5.0
RAS# to CAS# delay 3 4 5
RAS# Precharge 3 4 5
TRAS 9 12 18
TRC 12 16 23


Software
------------------------------------------------------------------------------

Windows Version Microsoft Windows Vista (6.0) Ultimate Edition (Build 6000)
DirectX Version 10.0
================================================

As can be seen from the above results, the actual CPU clock is only 2407.2MHz instead of 3200MHz as stated on the retail box.

What has happened?

How do I reset the CPU clock to its real 3200MHz speed?
a b à CPUs
June 9, 2007 3:14:04 AM

Your cpu is running as fast as it can without an overclock. Your motherboard only has a 200mhz FSB.

Your cpu multiplier is 12x so...

12 * 200 = ~2400mhz

Most newer motherboards sport a 266mhz FSB, if we put that into the calculations...

12 * 266 = ~3200mhz

Its your motherboard's slower FSB that is the problem.
a b à CPUs
June 9, 2007 3:18:38 AM

It may be possible that your FSB is not set correctly, you are using a motherboard with a P965 chipset, it should be able to run a 266mhz FSB.
Related resources
June 9, 2007 4:08:22 AM

Download CPU-Z and see what it tell you.

@randomizer: Maybe the multiplier is 16x and SpeedStep is kicking in.

EDIT: According to Newegg, the processor is rated at an 800MHz bus, so I'm pretty sure SpeedStep is kicking in and lowering your multiplier from 16x to 12x. It only does this when the processor is relatively idle to conserve energy; it will go back to full speed when you put load on it. Just to make sure, run Orthos and use CPU-Z readings.
June 9, 2007 4:11:46 AM

yeah it's all about speed step for sure. For example right now my e6400 is running at 1.6Ghz but when a put a load on it, it runs at it's advertized speed.

Speedstep just saves some power and some heat.
a b à CPUs
June 9, 2007 4:21:47 AM

Ah yes, forgot speedstep :p 
June 9, 2007 6:24:53 AM

You're not going to see any performance loss with the CPU running below 3.2GHz... it will immediately jump up to its full speed when it needs to.

If you insist on having it disables, there should be an option in your BIOS... probably where the CPU options are. If you can't find SpeedStep, look for EIST something, and disable it.
a b à CPUs
June 9, 2007 6:49:28 AM

Mmm, yes, it must be EIST (speedstep) or C1E dropping the speed.
June 9, 2007 8:13:56 AM

Quote:
You're not going to see any performance loss with the CPU running below 3.2GHz... it will immediately jump up to its full speed when it needs to.

If you insist on having it disables, there should be an option in your BIOS... probably where the CPU options are. If you can't find SpeedStep, look for EIST something, and disable it.


I went into the BIOS (it's AMI BIOS) and under "CPU Configuration", I tweaked the following items:

C1E Support - Disabled
Max CPUID Value Limit - Enabled
CPU TM Function - Disabled
Exec Disable Bit - Enabled
Intel SpeedStep Tech - Disabled

After tweaking the above items, I ran CPU-Z on the PC and below are the results:

-------------------------
CPU-Z version 1.40
-------------------------

Processors Map
------------------------------------------------------------------------------------

Number of processors 1
Number of threads 2

Processor 0
-- Core 0
-- Thread 0
-- Core 1
-- Thread 0


Processors Information
------------------------------------------------------------------------------------

Processor 1 (ID = 0)
Number of cores 2
Number of threads 2 (max 2)
Name Intel Pentium D 935
Codename Presler
Specification Intel(R) Pentium(R) D CPU 3.20GHz
Package Socket 775 LGA (platform ID = 2h)
CPUID F.6.5
Extended CPUID F.6
Core Stepping D0
Technology 65 nm
Core Speed 3209.8 MHz (16.0 x 200.6 MHz)
Rated Bus speed 802.4 MHz
Stock frequency 3200 MHzInstructions sets MMX, SSE, SSE2, SSE3, EM64T
L1 Data cache 2 x 16 KBytes, 8-way set associative, 64-byte line size
Trace cache 2 x 12 Kuops, 8-way set associative
L2 cache 2 x 2048 KBytes, 8-way set associative, 64-byte line size
FID/VID Control yes
FID range 14.0x - 16.0x
VID range 1.116V - 1.276V

My question are: What are the advantages of enabling C1E or EIST or Intel SpeedStep technology? Or can I permanently disable C1E so as to achieve a constant CPU speed of 3.2GHz?

Thanks in advance for your recommendations.
June 9, 2007 9:11:05 AM

Bieing able to enable power saving features depends on the motherboad. EIST, C1E and Speedstep are their to save you power. When you need more oomph things will kick up on their own to the normal multiplier.
June 9, 2007 3:18:33 PM

Like I said, those features simply conserve power and heat. You don't need 3.2GHz to play Solitaire or run MS Word, so it lowers your CPU clock speed, thereby conserving energy and heat.

On the other hand, if you play Oblivion, you'd want the full speed of the CPU, in which case SpeedStep will automatically raise your CPU to its highest possible speed.
!