E6750 'G0' 8x333FSB + Asus P5K Deluxe

eva2000 · 26-06-2007, 02:55 PM

E6750 'G0' 8x333FSB + Asus P5K Deluxe

In a strange coincidence, I received my Intel Core 2 Duo E6750 'G0' stepping cpus yesterday which is the same day Intel officially lifted the NDA on the E6x50 series cpus. E6750 'G0' stepping with L710A438 batch - Malaysia plant - week 10, 2007.

(click image for close up of IHS)

E6x50 vs E6x00

From what I have read and seen, the only difference these E6x50 have from their older siblings, E6x00 is that E6x50 have:

Higher default front side bus speed of 1333Mhz versus 1067Mhz.
Inclusion of TXT - Intel Trusted Execution Technology to protect sensitive information from software related attacks. Exception being the E6540 cpu which is same as E6550 but without TXT.

Other than those 2 new features, the still has the same shared 4MB L2 cache. Reviews popping up on the internet, show E6750 has around 1-2% advantage over E6700 at default speeds due to the higher front side bus speed 8x333FSB vs 10x266FSB. But this higher default front side bus speed, also translates into slighty higher idle or EIST enabled idle speed temps.

System

Intel Core 2 Duo E6750 ES - L710A438 G0
Corsair Nautilus 500 3/8" ID
Asus P5K Deluxe 0311 bios
128MB Gainward FX5200 PCI
2x1GB Crucial PC2-8500 Ballistix dual channel kit in black dimm slots
74GB WD Raptor 8MB on SATA 2 port
Pioneer DVR-08 Burner
Sony FDD
1KW PCP&C SLI psu
WinXP Pro SP2

We've heard of E6850/E6550 'G0' ES samples doing awesome overclocks of 3.6ghz at stock vcore or high 540-550+ FSB. But there also seems to be 'G0' steppings that aren't as good and have FSB walls around 475-495FSB (could be motherboard/bios limit ? ).

This E6750 'G0' I'm testing is one of those more average ones. This E6750 'G0' stepping seems to behave like my Intel Core 2 Extreme X6800 L627A872 cpu on Asus P5K Deluxe maxing out FSB around 490-495FSB (bumping CPU PLL volts allowed 500FSB to just get in) with similar vcore to clock speed points at 3600Mhz at 1.43-1.45v and 3800Mhz at 1.5-1.55v and both run very cool even with high vcore.

The E6750 'G0' does run exceptionally colder though. With PECI enabled in bios, the E6750 as reported by AI Suite is running cooler and is within 4-8C of coretemp 0.94 reported temps. With PECI disabled, it's reported in AI Suite to be 10-12C hotter than coretemp 0.94 reported temps.

.

eva2000 · 26-06-2007, 03:30 PM

E6750 @2671Mhz - 8x333FSB 1:1

First look at E6750 at stock speeds of 8x333FSB.

Settings Used:

JumperFree Configuration Settings
AI Overclocking: Manual
CPU Ratio Control: Manual
- Ratio CMOS Setting: 8
FSB Frequency: 333
PCI-E Frequency: 100
DRAM Frequency: DDR2-667
DRAM Command Rate: 2T
DRAM Timing Control: Manual
CAS# Latency: 4
RAS# to CAS# Delay: 4
RAS# Precharge: 4
RAS# Activate to Precharge: 9
TWR: 3
TRFC: 30
TWTR: 3
TRRD: 3
TRTP: 8
DRAM Static Read Control: AUTO

Transaction Booster: AUTO
Boost Level: N/A
Clock Over-Charging Mode: AUTO

CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled

CPU Voltage: AUTO
CPU Voltage Reference: AUTO
CPU Voltage Damper: Enabled
CPU PLL Voltage: 1.50
DRAM Voltage: 2.00
FSB Termination Voltage: 1.30
North Bridge Voltage: 1.40
North Bridge Voltage Reference: AUTO
South Bridge Voltage: 1.05

Advance CPU Settings
CPU Ratio Control: Manual
- Ratio CMOS Setting: 8
C1E Suppport: Disabled
Max CPUID Value Limit: Disabled
Vanderpool Technology: Disabled
CPU TM Function: Disabled
Execute Disable Bit: Disabled
PECI: Enabled

USB Configuration
USB Functions: Enabled
Legacy USB Support: Disabled (need to enable it to detect USB flash drives)

Room temp = 25.5C to 27.5C

CPU @Idle

Prime95 v25.2 Small FFTs Load

Prime95 v25.2 Post Load Idle

.

eva2000 · 26-06-2007, 03:31 PM

E6750 @3600Mhz - 8x450FSB 1:1

Next my favourite clock speed to aim for @3600Mhz - 8x450FSB 1:1

Settings Used:

JumperFree Configuration Settings
AI Overclocking: Manual
CPU Ratio Control: Manual
- Ratio CMOS Setting: 8
FSB Frequency: 450
PCI-E Frequency: 100
DRAM Frequency: DDR2-900
DRAM Command Rate: 2T
DRAM Timing Control: Manual
CAS# Latency: 4
RAS# to CAS# Delay: 4
RAS# Precharge: 4
RAS# Activate to Precharge: 9
TWR: 3
TRFC: 30
TWTR: 3
TRRD: 3
TRTP: 8
DRAM Static Read Control: AUTO

Transaction Booster: AUTO
Boost Level: N/A
Clock Over-Charging Mode: AUTO

CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled

CPU Voltage: 1.45
CPU Voltage Reference: AUTO
CPU Voltage Damper: Enabled
CPU PLL Voltage: 1.50
DRAM Voltage: 2.10
FSB Termination Voltage: 1.30
North Bridge Voltage: 1.55
North Bridge Voltage Reference: AUTO
South Bridge Voltage: 1.05

Advance CPU Settings
CPU Ratio Control: Manual
- Ratio CMOS Setting: 8
C1E Suppport: Disabled
Max CPUID Value Limit: Disabled
Vanderpool Technology: Disabled
CPU TM Function: Disabled
Execute Disable Bit: Disabled
PECI: Enabled

USB Configuration
USB Functions: Enabled
Legacy USB Support: Disabled (need to enable it to detect USB flash drives)

Prime95 v25.2 Small FFTs Load

Post Load Idle

Super Pi 1M

Super Pi 32M

Everest Ultimate 4.00.1033 Build

Nuclearus 2.0 RC1

Cinebench 95

.

eva2000 · 26-06-2007, 03:31 PM

E6750 @3800Mhz - 8x475FSB 1:1

Vcore needs a substantial increase to get both cores bench stable @3800Mhz - 8x475FSB

Settings Used:

JumperFree Configuration Settings
AI Overclocking: Manual
CPU Ratio Control: Manual
- Ratio CMOS Setting: 8
FSB Frequency: 475
PCI-E Frequency: 100
DRAM Frequency: DDR2-950
DRAM Command Rate: 2T
DRAM Timing Control: Manual
CAS# Latency: 4
RAS# to CAS# Delay: 4
RAS# Precharge: 4
RAS# Activate to Precharge: 9
TWR: 3
TRFC: 30
TWTR: 3
TRRD: 3
TRTP: 8
DRAM Static Read Control: AUTO

Transaction Booster: AUTO
Boost Level: N/A
Clock Over-Charging Mode: AUTO

CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled

CPU Voltage: 1.5626
CPU Voltage Reference: AUTO
CPU Voltage Damper: Enabled
CPU PLL Voltage: 1.50
DRAM Voltage: 2.15
FSB Termination Voltage: 1.30
North Bridge Voltage: 1.55
North Bridge Voltage Reference: AUTO
South Bridge Voltage: 1.05

Advance CPU Settings
CPU Ratio Control: Manual
- Ratio CMOS Setting: 8
C1E Suppport: Disabled
Max CPUID Value Limit: Disabled
Vanderpool Technology: Disabled
CPU TM Function: Disabled
Execute Disable Bit: Disabled
PECI: Enabled

USB Configuration
USB Functions: Enabled
Legacy USB Support: Disabled (need to enable it to detect USB flash drives)

Super Pi 32M

Nice and fast times.. just the way I like it!

Single 32M

Dual 32M

Everest Ultimate 4.00.1033 Build

Nuclearus 2.0 RC1

Cinebench 95

.

eva2000 · 26-06-2007, 03:31 PM

E6750 @3840-3920Mhz - 8x480FSB-490FSB 1:1

Maxing out the FSB on E6750 'G0' seems to be around 490FSB stable and 495FSB i can probably pull off with some tweaking.

Super Pi 32M

3840Mhz - 8x480FSB 1:1 = 12m 47.032s
3920Mhz - 8x490FSB 1:1 = 12m 31.187s

Everest Ultimate 4.00.1033

@3840Mhz - 8x480FSB 1:1

@3920Mhz - 8x490FSB 1:1

Nuclearus 2.0 RC1

@3920Mhz - 8x490FSB 1:1

eva2000 · 26-06-2007, 03:32 PM

E6750 @3920Mhz - 8x490FSB 4:5

Now let's see what using 4:5 memory divider can bring in Super Pi 1M & 32M

Everest Ultimate 4.00.1033 Bandwidth

Not bad for loose memory timings @612Mhz 5-5-4-5. Still bit slower clock for clock than tighter timings @8x488FSB 5:6 with 585mhz 4-4-4-9 with my Q6600 here.

eva2000 · 26-06-2007, 03:32 PM

2x1GB Crucial PC2-8500 Ballistix @665.8Mhz 5-6-5-9

Thought I'd loosen up the memory timings to 5-6-5-9 and see how far I can go at 2.55v vdimm max with my 2x1GB Crucial PC2-8500 Ballistix dual channel kit in black dimm slots. Swapped in 92x38mm Delta 120cfm fan to cool the memory via a rheobus fan controller

Here's where I ended up @665.8Mhz 5-6-5-9 6-35-8-6-8 at 2.55v which is the highest memory frequency I've done to complete Super Pi 32M on any motherboard. Previous best was @650mhz 5-5-5-18 on Asus 680i Striker Extreme with 2x1GB OCZ PC2-9200 FlexXLC at 2.550v.

eva2000 · 26-06-2007, 03:32 PM

Quest to hit 4002Mhz

Found i could memtest86+ v1.70 if i pushed the CPU PLL voltage in bios from 1.6v to 1.8v (max). Also meant I could squeeze out a bit more FSB with 8x493FSB boot from bios into windows and setFSB bump from 493FSB to 500FSB

@8x493FSB at 1.6375v bios set

@498FSB at 1.6375v bios set

@500FSB at 1.6375v bios set

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