Stabilizing P4C800E-Deluxe

P4C800E-Deluxe modifications for overclocking stability

The original design of P4C800E-Deluxe(Rev.2.0) seems pretty good, however, some decoupling parts are not installed for the purpose of cost reduction. Re-installing these eliminated decouplings might improve the overclocking stability.
With these modifications shown below, the prime95(torture test) stable frequency improved from 3.3GHz(236MHz FSB) to 3.43GHz(245MHz FSB).[Jul. 31, 2004]
(Conditions: Ta=10..25 celcius, Vcore=1.52V(loaded), Turbo, PAT and Hyper threading enabled,
stable for at least two hours running two processes of prime95 torture test)

Proceccor decoupling (part side)

4 pcs. of 22uF (TaiyoYuden JMK316BJ226ML) multilayer ceramic capacitor added.(center)
8 pcs. of 10uF (TaiyoYuden LDK316BJ106ML) multilayer ceramic capacitor added.(left)
2 pcs. of 390uF (Panasonic EEFSE0E391R) solid aluminum-polymer capacitor might better be added.(right)

Proceccor decoupling (solder side)

2 pcs. of 47uF (TDK CA55Y5U1C476S) multilayer ceramic capacitor added.

North bridge decoupling

7 pcs. of 1uF (Murata GRM188F11C105ZA01D) multilayer ceramic capacitor added.

North bridge and clock generator cooling

The north bridge heatsink is modified with copper heat spreader and fin.
A heatsink is appended upon the clock generator.

With these modification shown above, the prime95 stable frequency rose up to 3.39GHz(242MHz FSB).

Vcore regulator output capacitor

2 pcs. of 820uF (Sanyo 2R5SEPC820M) solid aluminum capacitor added, (left) and 2 pcs. of 1500uF(KZG) are replaced by that. (right)
One piece of 1.5mF (Panasonic EEUFK0J152L) aluminum capacitor added.

Memory module Vddr decoupling

One piece of 680uF (Sanyo 4SEPC680M) solid aluminum capacitor added.

After installing Vcore and Vddr decoupling capacitors, the prime95 stable frequency rose up to 3.43GHz(245MHz FSB).

Few months later, at last.

All the capacitors at Vcore regulator output are replaced with solid aluminum 820uF((Sanyo 2R5SEPC820M) for long term stability.
Additional switching FETs are placed, one for each phase.

With 512MB by 4 DIMMs and a Pentium4-3.4 processor(SL793), it's been operating stable 24 hours 7 days at 3.7GHz.

Appendix. Major capacitors for processor decoupling.

Maker	Series	Dimensions	Capacitance	Voltage	Life(105°C)	ESR	Z(100kHz)	Ripple	Part code
Aluminum electrolytic, radial φ8, 16V
Sanyo	MV-WG	φ8 x 20	1000uF	16V	3000h	19mΩ	-	1870mA	16MV1000WGL
Aluminum electrolytic, radial φ10, 16V
Nichicon	HZ	φ10 x 25	1800uF	16V	2000h	6.5mΩ	-	4140mA	UHZ1C182MPM
Nichicon	HZ	φ10 x 20	1500uF	16V	2000h	7mΩ	-	3770mA	UHZ1C152MPM
Sanyo	MV-WG	φ10 x 23	1800uF	16V	4000h	12mΩ	-	2800mA	16MV1800WGL2
Rubycon	MBZ	φ10 * 23	1800uF	16V	2000h	12mΩ	-	2800mA	16MBZ1800M
Sanyo	MV-WG	φ10 x 20	1500uF	16V	4000h	13mΩ	-	2550mA	16MV1500WGL2
Rubycon	MBZ	φ10 * 20	1500uF	16V	2000h	13mΩ	-	2550mA	16MBZ1500M
Rubycon	ZLH	φ10 * 23	1800uF	16V	10000h	-	18mΩ	2250mA	16ZLH1800M
Nippon-chemicon	KZH	φ10 * 25	1800uF	16V	6000h	-	18mΩ	2250mA	KZH16VB1800MJ25
Panasonic	FM	φ10 * 25	1200uF	16V	5000h	-	18mΩ	2470mA	EEUFM1C122L
Rubycon	ZLH	φ10 * 20	1500uF	16V	8000h	-	20mΩ	1960mA	16ZLH1500M
Nippon-chemicon	KZE	φ10 * 25	1200uF	16V	4000h	-	22mΩ	2150mA	KZE16VB1200MJ25
Aluminum electrolytic, radial φ12.5, 16V
Panasonic	FM	φ12.5 * 35	3300uF	16V	7000h	-	12mΩ	3750mA	EEUFM1C332L
Panasonic	FM	φ12.5 * 30	2700uF	16V	7000h	-	13mΩ	3630mA	EEUFM1C272L
Panasonic	FM	φ12.5 * 25	2200uF	16V	7000h	-	15mΩ	3190mA	EEUFM1C222
Nippon-chemicon	KZH	φ12.5 * 35	3900uF	16V	6000h	-	12mΩ	3570mA	KZH16VB3900MK35
Nippon-chemicon	KZH	φ12.5 * 30	3300uF	16V	6000h	-	13mΩ	3450mA	KZH16VB3300MK30
Nippon-chemicon	KZH	φ12.5 * 25	2700uF	16V	6000h	-	15mΩ	2900mA	KZH16VB2700MK25
Nippon-chemicon	KZE	φ12.5 * 35	3300uF	16V	5000h	-	15mΩ	3400mA	KZE16VB3300MK35
Nippon-chemicon	KZE	φ12.5 * 30	2700uF	16V	5000h	-	16mΩ	3290mA	KZE16VB2700MK30
Nippon-chemicon	KZE	φ12.5 * 25	2200uF	16V	5000h	-	18mΩ	2770mA	KZE16VB2200MK25
Aluminum electrolytic, radial φ8, 6.3V
Nichicon	HZ	φ8 * 20	1800uF	6.3V	2000h	9mΩ	-	2880mA	UHZ0J182MPM6
Nichicon	HZ	φ8 * 20	1500uF	6.3V	2000h	9mΩ	-	2880mA	UHZ0J152MPM6
Rubycon	MCZ	φ8 * 20	1800uF	6.3V	2000h	12mΩ	-	2350mA	6.3MCZ1800M
Nichicon	HN	φ8 * 20	1800uF	6.3V	2000h	12mΩ	-	2220mA	UHN0J182MPM6
Nichicon	HN	φ8 * 20	1500uF	6.3V	2000h	12mΩ	-	2220mA	UHN0J182MPM6
Sanyo	MV-WG	φ8 * 20	1800uF	6.3V	3000h	16mΩ	-	1950mA	6MV1800WGL2
Rubycon	MBZ	φ8 * 20	1800uF	6.3V	2000h	19mΩ	-	1870mA	6.3MBZ1800M
Panasonic	FM	φ8 * 20	1200uF	6.3V	4000h	-	30mΩ	1560mA	EEUFM0J122L
Nippon-chemicon	KZH	φ8 * 20	1500uF	6.3V	6000h	-	33mΩ	1410mA	KZH6.3VB1500MH20
Nippon-chemicon	KZE	φ8 * 20	1200uF	6.3V	3000h	-	41mΩ	1250mA	KZE6.3VB1200MH20
Panasonic	FK	φ8 * 20	1500uF	6.3V	3000h	-	44mΩ	1220mA	EEUFK0J152L
Aluminum electrolytic, radial φ10, 6.3V
Nichicon	HN	φ10 * 25	3300uF	6.3V	2000h	9mΩ	-	3190mA	UHN0J332MPM
Rubycon	MBZ	φ10 * 23	3300uF	6.3V	2000h	12mΩ	-	2800mA	6.3MBZ3300M
Sanyo	MV-WX	φ10 * 20	1500uF	6.3V	4000h	-	23mΩ	1820mA	6.3MV1500WX
Solid aluminum-polymer, radial φ8
Fujitsu	FP RE	φ8 * 11.5	560uF	4V	2000h	5mΩ	-	6630mA	FP-4R0RE561M-R5
Sanyo	SEPC	φ8 * 13	680uF	4V	2000h	7mΩ	-	6100mA	4SEPC680M
Sanyo	SEPC	φ8 * 13	560uF	4V	2000h	7mΩ	-	6100mA	4SEPC560M
Nippon-chemicon	PSA	φ8 * 11.5	560uF	4V	2000h	7mΩ	-	5580mA	PSA4VB560MH11
Nippon-chemicon	PS	φ8 * 11.5	560uF	4V	2000h	10mΩ	-	5230mA	4SP560MH11
Sanyo	SPA	φ8 * 10	560uF	4V	1000h	12mΩ	-	4520mA	4SPA560M
Sanyo	SEP	φ8 * 12	560uF	4V	3000h	13mΩ	-	4520mA	4SEP560M
Fujitsu	FP RE	φ8 * 11.5	560uF	4V	2000h	14mΩ	-	4080mA	FP-4R0RE561M-S1R
Sanyo	MB-EXR	φ8 * 12	560uF	4V	2000h	14mΩ	-	1780mA	4MB560EXR
Fujitsu	FP RE	φ8 * 11.5	820uF	2.5V	2000h	5mΩ	-	6630mA	FP-2R5RE821M-R5
Sanyo	SEPC	φ8 * 9	820uF	2.5V	2000h	7mΩ	-	6100mA	2SEPC820MX
Sanyo	SEPC	φ8 * 13	820uF	2.5V	2000h	7mΩ	-	6100mA	2R5SEPC820M
Nippon-chemicon	PSA	φ8 * 11.5	820uF	2.5V	2000h	7mΩ	-	5580mA	PSA2.5VB820MH11
Solid aluminum-polymer, radial φ10
Fujitsu	FP RE	φ10 * 12.5	820uF	4V	2000h	5mΩ	-	7220mA	FP-4R0RE821M-R5
Fujitsu	FP RE	φ10 * 12.5	1200uF	4V	2000h	5mΩ	-	7220mA	FP-4R0RE122M-R5
Nippon-chemicon	PSA	φ10 * 11.5	820uF	4V	2000h	6mΩ	-	5860mA	PSA4VB820MJ11
Sanyo	SEPC	φ10 * 13	820uF	4V	2000h	7mΩ	-	6640mA	4SEPC820M
Fujitsu	FP RE	φ10 * 12.5	1500uF	2.5V	2000h	5mΩ	-	7220mA	FP-2R5RE152M-R5
Nippon-chemicon	PSA	φ10 * 11.5	1000uF	2.5V	2000h	6mΩ	-	5860mA	PSA2.5VB1000MJ11
Sanyo	SEPC	φ10 * 13	2700uF	2.5V	2000h	10mΩ	-	5560mA	2SEPC2700M
Solid aluminum-polymer, surface mount
Panasonic	SE	L7.3 * W4.3 * H4.2	390uF	2.5V	1000h	5mΩ	-	4000mA	EEFSE0E391R
Panasonic	SD	L7.3 * W4.3 * H2.8	270uF	2.5V	1000h	7mΩ	-	4000mA	EEFSD0E271R
Panasonic	SX	L7.3 * W4.3 * H1.9	150uF	2.5V	1000h	9mΩ	-	3500mA	EEFSE0E151R
Rubycon	SW	L7.3 * W4.3 * H2.7	180uF	2.5V	1000h	10mΩ	-	3500mA	2.5SW180M
Panasonic	UE	L7.3 * W4.3 * H4.2	330uF	2.5V	1000h	10mΩ	-	3500mA	EEFUE0E331XR
Panasonic	UE	L7.3 * W4.3 * H4.2	390uF	2.5V	1000h	12mΩ	-	3300mA	EEFUE0E391R
Fujitsu	FP CS	L7.3 * W4.3 * H1.8	220uF	2.5V	1000h	55mΩ	-	1700mA	FP-2R5CS221M-E0R
Solid tantalum-polymer, surface mount
Sanyo	TPD	L7.3 * W4.3 * H3.8	680uF	2.5V	2000h	5mΩ	-	6100mA	2R5TPD680M5
Sanyo	TPD	L7.3 * W4.3 * H3.8	680uF	2.5V	2000h	6mΩ	-	5600mA	2R5TPD680M6
Sanyo	TPD	L7.3 * W4.3 * H3.8	680uF	2.5V	2000h	8mΩ	-	4900mA	2R5TPD680M8
Sanyo	TPD	L7.3 * W4.3 * H3.8	1000uF	2.5V	2000h	8mΩ	-	4900mA	2R5TPD1000M8
Sanyo	TPE	L7.3 * W4.3 * H1.8	470uF	2.5V	2000h	9mΩ	-	3900mA	2R5TPE470M9
Sanyo	TPD	L7.3 * W4.3 * H3.8	680uF	2.5V	2000h	10mΩ	-	4400mA	2R5TPD680M
Multilayer ceramic, surface mount
TDK	C	L5.7 * W5.0 * H2.3	47uF	16V	-	<6mΩ	-	-	C5750X5R1C476M
Mitsubishi materials	KC	L5.6 * W5.0 * H2.5	47uF	16V	-	-	-	-	KC80E1C476M-TS
Taiyo yuden	M	L3.2 * W1.6 * H1.6	22uF	6.3V	-	<5mΩ	-	-	JMK316BJ226ML
Taiyo yuden	M	L3.2 * W2.5 * H2.5	100uF	6.3V	-	<5mΩ	-	-	JMK325F107ZM-B