Quad-Core^4

DFI UT P35-T2R
Overclocking Benchmark Testbed
Processor Intel Core 2 Quad QX6800 ES - G0 Stepping
Quad Core, 2.93GHz, 8MB Unified Cache, 11x Multiplier, 1066FSB
Intel Core 2 Duo X6800
Dual Core, 2.93GHz, 4MB Unified Cache, 11x Multiplier, 1066FSB
CPU Voltage 1.300V Base
Cooling Various - Tuniq Tower, Swiftech Apogess GTX, Dual Rotary Cascade
Power Supply OCZ ProXStream 1000W, PCP&C 1200W
Memory OCZ Flex PC2-9200 (2x1GB, 4x1GB)
Memory Settings 4-4-4-12 (DDR2-1066)
Video Cards NVIDIA 8800GTX Ultra, NVIDIA 7600GS, NVIDIA 8800 GTS 640MB
Video Drivers NVIDIA 163.44
Hard Drive Western Digital 7200RPM 250GB - WD2500KS
Optical Drives Plextor PX-755A
Case Cooler Master Stacker 830 Evo, Open Test Bed
BIOS DFI 9/13
Operating System Windows XP Professional SP2
.

Our BIOS settings for 450FSB with a quad-core CPU using 2GB of RAM

Parts used for this stability test

Qx6800 ES G0
OCZ ProXStream 100w
2GB OCZ Flex 9200 RAM
Tuniq Tower with additional Panaflo 120mm fan
WD2500 KS 250GB Hard Drive
Plextor 755a DVD/RW
NVIDIA 7600 GS

450FSB Quad-Core BIOS Settings
CPU Feature
Thermal Management Control Disabled
PPM (EIST) Mode Disabled
Limit CPUID MaxVal Disabled
CIE Function Disabled
Execute Disable Bit Disabled
Virtualization Technology Disabled
Core Multi-Processing Enabled
Exist Setup Shutdown Mode 2
CLOCK VC0 divider AUTO
CPU Clock Ratio 8x
Target CPU Clock 3600MHz
CPU Clock 450FSB
Boot Up Clock AUTO
DRAM Speed 266MHz/667MHz
Target DRAM Speed DDR2-1125MHz
PCIE Clock 100MHz
Voltage Settings
CPU VID Control 1.39
CPU VID Special Add AUTO
DRAM Voltage Control 2.1
SB 1.05V Voltage 1.07v
SB Core/CPU PLL Voltage 1.55v
NB Core Voltage 1.61
CPU VTT Voltage 1.60v
VCore Droop Control Disabled
Clockgen Voltage Control 3.45v
GTL+ Buffers Strength Strong
Host Slew Rate Weak
GTL REF Voltage Control Enabled
x CPU GTL1/3 REF Volt 115
x CPU GTL 0/2 REF Volt 114
x North Bridge GTL REF Volt 117
DRAM Timing
Enhance Data transmitting FAST
Enhance Addressing FAST
T2 Dispatch Disabled
Channel 1 CLK Crossing Setting More Aggressive
Channel 2 CLK Crossing Setting More Aggressive
CH1CH2 Common CLK Crossing Setting More Aggressive
CAS Latency Time (tCL) 5
RAS# to CAS# Delay (tRCD) 5
RAS# Precharge (tRP) 4
Precharge Delay (tRAS) 9
All Precharge to Act 4
REF to ACT Delay (tRFC) 30
Performance Level 6
Read delay phase adjust AUTO
MCH ODT Latency 1
Write to PRE Delay (tWR) 12
Rank Write to Read (tWTR) 10
ACT to ACT Delay (tRRD) 3
Read to Write Delay (tRDWR) 8
Ranks Write to Write (tWRWR) AUTO
Ranks Read to Read (tRDRD) AUTO
Ranks Write to Read (tWRRD) AUTO
Read CAS# Precharge (tRTP) 3
ALL PRE to Refresh 4
PCIE Slot Config 1X 1X
CPU Spread Spectrum Disabled
PCIE Spread Spectrum Disabled
SATA Spread Spectrum Disabled

450FSB Stability Test


Water-Cooling

After attaining a decent 3.6GHz performance overclock on air-cooling, the decision was taken to move over to water-cooling for the CPU. Our QX6800 G0 ES is not one of the coolest running G0 CPUs around. Up to 3.6GHz the current G0 stepping quad-core CPUs all seem to be able to cope with less than 1.4V. However, cruising over 3.6GHz results in a non-linear VCore scaling process per CPU MHz increase. We found ourselves tapped out for further overhead with 100% CPU load tests. We were able to run most benchmarks at around 3.9GHz with the same air-cooling, with around 1.5Vcore to hold the CPU steady. Results placed on various forums have shown some users Prime95 stable for all software up to 3.8GHz with good CPUs using top-end air-cooling.

The following Water Cooling components were used for this test:

Swiftech Apogee GTX CPU waterblock
2x Petra Top Laing DDC Ultra water pumps in series
Swiftech Micro-Res
Thermochill PA120.3 Radiator, with 3x Panaflo 120mm fans
Danger Den 1/2" ID Tubing

This swap to water-cooling allowed us sufficient temperature overhead to run Prime95 type tests for 11 hours with speeds of 3.72GHz @ 465FSB on the 333 strap with 4GB of RAM, while holding 470FSB on the 266 strap and 2GB of memory stable at around 467FSB. A 5-7 FSB margin above Prime95 type testing is often usable for those who do not require absolute 100% load stability to find sleep at night.

Prime95 and Everest


We found that CPU scores in 3DMark06 using the DFI P35 T2R were higher than we were accustomed to on the acclaimed 975X chipset. We managed to push 4GB of RAM to 490FSB with water-cooling for a quick run of 3DMark06. The board at this point however was right on the ragged edge and would not run SuperPi 32M without a failure.


Quad-Core, Part 3 Benchmark Performance Comparisons
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  • retrospooty - Sunday, October 21, 2007 - link

    Not really. Check this memory test here at AT. http://www.anandtech.com/memory/showdoc.aspx?i=312...">http://www.anandtech.com/memory/showdoc.aspx?i=312...

    At DDR 2000 at 6X500 CPU the best sisoft standard memory score for DDR3 is 9138 at DDR3 2000 8-7-6-18 ... I get 8871 with my DDR2 1000mhz at 4-4-4-10 with a similar setup on the DFI P35 mobo. DDR3 even at a highly overclocked 2000mhz is hardly faster than DDR2 at 1000 now. I am not going to go to DDR3 until Nehalem is cheap, and DDR3 latency is lower and cheap, 2 more years out.

    And PCI-E 2.0 is not going to help for a long time. Like with PCI to AGP, and AGP to PCI-E there is no improvement at all right off the bat. The graphic bus standard is always WAY ahead of the actual cards need for it, 1-2 years at least. We are not even utilizing PCI-E 8x, much less 16x, not even with dual 8800GTX's. Also , PCI-E 2.0 is backward compatible, so I I get the latest greatest Graphic card next year (whatever it is) it will be PCI-E 2.0, but will work fine on PCI-E 1 motherboards.
  • Raja Gill - Thursday, October 18, 2007 - link

    It's one of those things in life, despite having no real logic to it, 'tweaking' actually has a market. DFI took a risk, while this segment does not guarantee large sale volumes, some of the return is made up in a higher profit margin. Without DFI around, some of the more pioneering BIOS options (that actually are of use to Joe blow due to Intel's binning strategy), would never filter thru to other boards. The asking price is high, both Gary and myself recognised this. It has to be said that those who have paid the premium have generally not been dissapointed. In terms of the cascade results, yes, boardss like this and Asus's ROG line are used by the benchmarking community to chase big records, again this is a growing community who pays high dollar for every last drop of performance. We are aiming to satisfy a slightly wider audience with the performance board reviews, by looking at how they will be used, and help out with settings by spending long hours exploring the BIOS functions ourselves, still trying to give a balanced view for JB and some insight to help the benchmarkers decide if the board fits their needs... The bios's on so many of these boards are getting more complex, we hope those who buy the boards can use some of the settings we provide to get a base to work from, (if they need it)..

    If there's anything else you would like to see added, please let us know....

    regards
    Raja
  • Jodiuh - Friday, October 19, 2007 - link

    SCREW THEM ALL! I've been drinking and still managed this in under 2 hours.

    http://img.photobucket.com/albums/v212/jodiuh/DFI%...">http://img.photobucket.com/albums/v212/...0UT%20P3...

    Sure I've been able to achieve good results w/ lowly air on the Giga DS3, Asus P5B, DFI Dark, and Abit IP35, but this board:

    1. makes oc fun
    2. great layout (usb ports towards the front where they should be, shame Abit)
    3. great stock cooling, especially for air
    4. excellent bios
    5. did I mention speed drunk oc? (beer, then 50mhz on the bus)

    It's truly a great game. And for about $260, it's a steal. There's no other board that offers this much pleasure. Sure it's $, but then didn't most of you pay $320 for your 6600's? :D
  • Avalon - Friday, October 19, 2007 - link

    Any drunk monkey could OC a decent C2D to 3.5Ghz. I've had plenty of fun OC'ing on my $90 Gigabyte P35 DS3L, which also has a great layout and decent BIOS. It's no DFI, but it gets the job done for $160 less, which is enough money for me to buy a decent video card, 4GB of RAM, 750GB of hard drive space, etc...

    Don't get me wrong, DFI is by far my favorite motherboard company, and their BIOS tweaking is the best available. However, I will NEVER consider a $260 board a "steal" when the only thing I'll get out of it over a significantly cheaper board is that I have more settings to play with if I feel bored. Fortunately, when I get bored, I load up a game, instead.
  • cmdrdredd - Saturday, October 20, 2007 - link

    Avalon hit it right on the head. Any decent C2D can do over 3.2Ghz and some up close to 4Ghz with proper cooling on $90 boards. There is absolutely NO reason to buy a $260 board this late to market. Not to mention that it is also slower than boards which retail for less money in this review at the settings used.

    The number of people actually willing to and wanting to use 550Mhz+ FSB is too small to matter.

    /end
  • Jodiuh - Tuesday, October 23, 2007 - link

    Most of the 965 board's are a crap shoot for 500fsb, but the 2 p35's I've used had no qualms about this. It's not just getting the OC for me tho. I needed a board that:

    -doesn't look like rainbow brite exploded on it (Gigabyte DS3)
    -doesn't use an AMI bios, hits 500+ FSB easily (Asus P5B Deluxe)
    -doesn't crackle (DFI P965-S, Abit IP35 Pro)
    -isn't NV (EVGA 680i)

    -has usb ports, front panel header, and SATA ports in the far right of the board
    -and of course the great stock cooling (uses nuts/bolts), excellent bios, and stable voltages add to the package

    There's just no other non-Asus board that did all that right now. Paying another $70 for the extras isn't an issue for a hobbyist that plays w/ his rig.
  • Acanthus - Friday, October 19, 2007 - link

    Yes, we did.

    And on quad cores, this board does no better than other boards much cheaper than itself.

    I am not here to bash DFI, they make great stuff.

    The price of admission is too high for this board for quad overclocking from the results i've seen. The FSB limitation appears to be the G0 quads themselves, they all seem to top out at 470-510fsb anyway. The Asus P5K and Gigabyte P35 DQ6 both easily do those speeds on unmodified boards.
  • customcoms - Thursday, October 18, 2007 - link

    Thanks anandtech for providing an overclocking article TRULY worth reading! We needed a motherboard review like this when DFI's original nForce4 boards came out-trying to figure out every bios option, while fun and rewarding, is a very very time consuming process.

    Its one thing for a reviewer to claim "this board is capable of 500+ fsb speeds" and another COMPLETELY for that reviewer to document virtually every step and every bios option they used to get to that speed. This review is along the lines of the user reviews I normally turn to to verify the components I am interested work as advertised. While the cascade cooling results and extreme price of this board could have been left out, it is good to see a reviewer actually using the hardware in the environment a $300 (or $260, or any board over $200 imo) motherboard is going to be used in.
  • Jodiuh - Thursday, October 18, 2007 - link

    It can be found for $260 from motherboardpro. Comes w/ a nice little LAN carrying harness too.
  • cmdrdredd - Thursday, October 18, 2007 - link

    Still too much money. As was said before, it still does not beat some of the boards which have been out for a long time. Sure it looks nice, but for the money spent here, you can buy more memory or the next step up in CPU if you go with a less expensive board.

    It's late, expensive, and does not have any magic that makes me say "it's better than anything else out there". Even the $90 IP35-E is a good match against this DFI board unless you have to or like to spend hours setting up the bios just so.

    It's nice, but like I said too little too late.

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