Intel 570 CPU + Soltek SL-915GPRO-FGR Motherboard

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Photo of 570J taken after removal from test board; it was multiplier unlocked. :)

The 570J sample that Intel delivered into my hands is the fastest clocked processor anyone else has produced for the desktop thus far. Now that Intel has shelved the target of reaching 4 GHz with the P4 architecture, it stands as the final outpost in a long road that began several years ago all the way back at 1.3 GHz with a 0.18 micron core on Socket 423 (remember those?) with 256 KB L2 Cache. The comparison below between the 570, the P4-3.0 Northwood in my main system, and the first P4 just mentioned are worth a look.

Three Flavors of P4
Processor P4 570J P4-3.0C P4-1.3
Architecture 90 nanometer technology 0.13 micron technology 0.18 micron technology
L2 Cache 1MB 512 KB 256 KB
Clock Speed 3.80 GHz 3 GHz 1.30 GHz
Front Side Bus Speed 800 MHz 800 MHz 400 MHz
Other Intel Technologies HT Enabled,
Execute Disable Bit
HT Enabled N/A
Memory Type Dual Channel DDR 400/333,
Dual Channel DDR2 400/533
Dual-Channel DDR 400/333/266 SDRAM PC133 SDRAM,
Dual-Channel DDR 400/333/266 SDRAM,
DDR 266/200 SDRAM,
DDR 333/266 SDRAM
Socket Type SOCKET 775 SOCKET 478 SOCKET 423
Min-Max Core Voltage 1.25-1.40V 1.475-1.525V 1.56V~2.1V
Thermal Design Power / Maximum Power* 115W / 151W 81.9W / 100.4W 48.9W / 65.2W
sSpec Number SL82U SL6WK SL5FW
* Maximum Power is the calculated theoretical maximum power that can be reached based on peak VA. However, CPU Throttling may prohibit the P4 from ever reaching this maximum power state.


The motherboard was assembled and tested as an open system not enclosed in a case.

Intel 570J (P4-3.8GHz) Prescott "EO" core - Maximum power is unknown. Sample kindly provided by Intel.
Soltek SL-915GPRO-FGR motherboard - Intel 915G Chipset; on-die CPU thermal diode monitoring
Thermalright XP-120 heatsink + 120mm "OEM" Panaflo @ 5 volts
Mushkin PC3200 Level II - 2 x 512MB DDRAM
Seagate 80GB Barracuda IV hard drive
Seasonic Super Silencer 300W (rev A1) PSU modded with 5V Panaflo M1A
Arctic Silver Ceramique Thermal Compound
Two-level metal platform with rubber damping feet. Motherboard on top; other components below.
CPUBurn processor stress software
Motherboard Monitor software to track CPU temperature, system voltage and fan speed.


Building a system with the board was free of hassles other than just having one native PATA channel and the awkward layout of the PATA and floppy connectors. Many of us still use this type of hardware and would appreciate connectors in better positions. Kudos for the location of the ATX and 12V AUX connectors, which are in the high corner of the board, out of the way of everything. For this P4-3.8 Prescott, I wanted to use the best possible cooler. The Thermalright XP-120 is my cooler of choice for this CPU, but my sample only came with socket 478 mounting hardware. Fortunately, Thermalright released the LGA775-RM, a 775 socket mounting adapter for the XP-120 and XP-90. They sent me one to try.

The LGA775-RM allows the Thermalright XP-120 and XP-90 to be used on socket 775 boards.
It is now included as standard with the Intel version of the XP-120 and XP-90 HS.

Installation of the LGA775-RM was a cinch.
The positioning of the four socket 478 mounting hooks is just right, and the steel backplate provides great support for the heatsink and fan.

The LGA775-RM adapter was used to mount the big XP-120 cooler on this board. There were no issues with clearance due to the large clear area around the socket. I plopped the good 'ol stand-by "OEM" 120mm Panaflo on top of the XP-120 and fired her up. The system booted right up the first time with no trouble. The BIOS is a full featured AMI, with a wide Vcore range down to 0.85. FSB cannot be dropped below the default 200 MHz, however. The Intel 570J CPU was unlocked and the multiplier adjustments provided in the BIOS worked perfectly.

In case you missed it above, I reiterate: The review was done using the onboard video. This obviously has an impact on overall system power draw and heat, although the exact degree of impact is difficult to determine accuractly.

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