Have a hot E4300 chip? Download CoreTemp 0.95 and check the reported Tjunction (S&M 1.9 if CoreTemp crashes with your rig). Those chips with 100C Tjunction can put out a lot of heat above 1.4Vcore. Fortunately, these chips will also overclock a little better than their 85C Tjunction cousins. Here's one way to reduce the peak core temperature by 7-9C. This mod should work with other "HOT" E4xxx CPUs.
1. Remove the copper heat spreader. I use those thin razor blades found in the Schick Quatto. Be careful not to bend/nick the blades when you disassemble the removable cartridge. A damaged blade can scratch the CPU board, rendering it useless.
Position the middle of the blade at the top corner of the heat spreader. Wiggle the blade between the heat spreader and the CPU board. Keep the blade parallel to the CPU board to avoid scratching the board. You can put some paper towel between your fingers and the blade to apply more force. The blades are sharp, even on the non-cutting side!
The black adhesive compound extends 0.27" to 0.30" from the outer edge of the CPU board. Mark the blade at 0.35" so that you don't cut too far into the CPU. When the blade is in far enough to cut the inner-most layer of black adhesive, rotate the blade so that it is perpendicular to the CPU board. Slowly wiggle the blade up and down (DO NOT move in and out) along the length of the heat spreader. If you encounter resistance because the heat spreader is very close to the CPU board, then pull out the blade and work the blade in the other direction. You should be able to push the blade forward without "wiggling" at the 1/2 way point.
Remove the blade and wiggle/rotate (10 degree) the heat spreader to break lose from the CPU core. DO NOT use any tool to pry out the heat spreader. WARNING: the heat spreader of E6xxx chip is soldered to the CPU core! You should not un-cap these chips since the soldered joint has excellent heat transfer characteristic.
2. Remove the black adhesive from the bottom of the heat spreader by lapping it with 400 sandpaper until only bare copper is visible at this contact area. This will ensure that there is sufficient gap to allow the heat spreader to come in full contact with the CPU core when you re-assemble the chip.
3. Lap the top and bottom of the heat spreader down to 2000 sandpaper. I put sandpaper between the heat spreader and a credit card (cut to size) when lapping the inside of the heat spreader. Position the heat spreader at 45 angle and move it from side to side to polish the surface. Remove sufficient material so that bare copper is visible.
4. Clean CPU and heat spreader well with alcohol.
5. Apply a thin even layer of grease on the CPU core and the bottom of the heat spreader. DO NOT put too much grease since you already have a very smooth finish on the CPU core and the heat spreader. Put the CPU on the motherboard. Center the heat spreader on top of the CPU core and close the CPU retainer level. Most CPU coolers will not fit directly on top of the CPU core. It's also easier to damage the CPU core if one does not take extreme precaution during re-assembly of the CPU cooler. The lapper heat spreader will only add 1 to 2C to the peak CPU temperature.
E4300, 3.44GHz, 1.465Vcore, 82F ambient, C1E and EIST enabled, Big Typhoon with medium speed 120 x 38 mm Panaflo
Before Mod:
- Speedfan 4.32 idle (25C), CoreTemp 0.95 idle (40C)
- Speedfan 4.32 Orthos Large (67C), CoreTemp 0.95 Orthos Large (82C)
After Mod:
- Speedfan 4.32 idle (24C), CoreTemp 0.95 idle (39C)
- Speedfan 4.32 Orthos Large (58C), CoreTemp 0.95 Orthos Large (73C)
It's perfectly okay for those E4300s with 100C Tjunction to run at 75C under CoreTemp 0.95. If you have a chip with 85C Tjunction, then you should limit the temperature to about 60C. A quick 10 min test @ 90-100C should not be an issue.
1. Remove the copper heat spreader. I use those thin razor blades found in the Schick Quatto. Be careful not to bend/nick the blades when you disassemble the removable cartridge. A damaged blade can scratch the CPU board, rendering it useless.
Position the middle of the blade at the top corner of the heat spreader. Wiggle the blade between the heat spreader and the CPU board. Keep the blade parallel to the CPU board to avoid scratching the board. You can put some paper towel between your fingers and the blade to apply more force. The blades are sharp, even on the non-cutting side!
The black adhesive compound extends 0.27" to 0.30" from the outer edge of the CPU board. Mark the blade at 0.35" so that you don't cut too far into the CPU. When the blade is in far enough to cut the inner-most layer of black adhesive, rotate the blade so that it is perpendicular to the CPU board. Slowly wiggle the blade up and down (DO NOT move in and out) along the length of the heat spreader. If you encounter resistance because the heat spreader is very close to the CPU board, then pull out the blade and work the blade in the other direction. You should be able to push the blade forward without "wiggling" at the 1/2 way point.
Remove the blade and wiggle/rotate (10 degree) the heat spreader to break lose from the CPU core. DO NOT use any tool to pry out the heat spreader. WARNING: the heat spreader of E6xxx chip is soldered to the CPU core! You should not un-cap these chips since the soldered joint has excellent heat transfer characteristic.
2. Remove the black adhesive from the bottom of the heat spreader by lapping it with 400 sandpaper until only bare copper is visible at this contact area. This will ensure that there is sufficient gap to allow the heat spreader to come in full contact with the CPU core when you re-assemble the chip.
3. Lap the top and bottom of the heat spreader down to 2000 sandpaper. I put sandpaper between the heat spreader and a credit card (cut to size) when lapping the inside of the heat spreader. Position the heat spreader at 45 angle and move it from side to side to polish the surface. Remove sufficient material so that bare copper is visible.
4. Clean CPU and heat spreader well with alcohol.
5. Apply a thin even layer of grease on the CPU core and the bottom of the heat spreader. DO NOT put too much grease since you already have a very smooth finish on the CPU core and the heat spreader. Put the CPU on the motherboard. Center the heat spreader on top of the CPU core and close the CPU retainer level. Most CPU coolers will not fit directly on top of the CPU core. It's also easier to damage the CPU core if one does not take extreme precaution during re-assembly of the CPU cooler. The lapper heat spreader will only add 1 to 2C to the peak CPU temperature.
E4300, 3.44GHz, 1.465Vcore, 82F ambient, C1E and EIST enabled, Big Typhoon with medium speed 120 x 38 mm Panaflo
Before Mod:
- Speedfan 4.32 idle (25C), CoreTemp 0.95 idle (40C)
- Speedfan 4.32 Orthos Large (67C), CoreTemp 0.95 Orthos Large (82C)
After Mod:
- Speedfan 4.32 idle (24C), CoreTemp 0.95 idle (39C)
- Speedfan 4.32 Orthos Large (58C), CoreTemp 0.95 Orthos Large (73C)
It's perfectly okay for those E4300s with 100C Tjunction to run at 75C under CoreTemp 0.95. If you have a chip with 85C Tjunction, then you should limit the temperature to about 60C. A quick 10 min test @ 90-100C should not be an issue.
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