PCI Express Freq Affecting my system stability

blurblock · 12-26-2007, 11:00 AM

I reliase something .

with PCI Express Freq @ 100mhz

FSb at most @223 x 15 = 3345 .

Once i start increasing the PCI Express Freq i can go higher .

Until i reach 4.0Ghz with 133mhz PCi Express Freq .

try starting on 4.0Ghz .

My system cant even detech my hdd . Please insert a boot media .

no choice but to get back to 3.3Ghz .

Question : Hows the PCI Express Is relation to FSB . If i but a new mobo like msi p35 neo2 FR will things get better ? . Overclock without adjusting the PCI express freq ?

hermeslyre · 12-26-2007, 11:35 AM

The PCI-e bus speed and the FSB are usually not relative. Generally, people are advised not to attempt to overclock the PCI or PCI-e bus. All it does is increase bandwidth over that bus, and often, create system instability. In other words, little to be gained, and system stability to be lost.

Overclock without messing with the PCI-e bus speed, yes.

blurblock · 12-26-2007, 12:28 PM

but the problem is i have to adjust the PCi express freq in order to pass 225mhz . i can choose from 100mhz - 133mhz there's no auto function .

[-0MEGA-] · 12-26-2007, 02:42 PM

100MHz is the default for the PCI-E bus, and it's odd that you need to raise it in order to overclock. The only time I would sya that increasing it becomes useful, is if you are running SLI/CF on a board which restricts the secondary slot to only 4x or 8x speed.

blurblock · 12-26-2007, 09:47 PM

but my mobo MSI 945P nEo2 F force me to increase then PCI Express freq in order to go pass 225MHZ . And its 100 - 133 NO AUTO function . So im wondering is it the mobo tat cause my overclocking to fail . ?

12-26-2007, 11:00 AM	#1 (permalink)
blurblock Gold Member Join Date: Sep 2005 Location: Singapore Age: 19 Posts: 359	PCI Express Freq Affecting my system stability I reliase something . with PCI Express Freq @ 100mhz FSb at most @223 x 15 = 3345 . Once i start increasing the PCI Express Freq i can go higher . Until i reach 4.0Ghz with 133mhz PCi Express Freq . try starting on 4.0Ghz . My system cant even detech my hdd . Please insert a boot media . no choice but to get back to 3.3Ghz . Question : Hows the PCI Express Is relation to FSB . If i but a new mobo like msi p35 neo2 FR will things get better ? . Overclock without adjusting the PCI express freq ? __________________ CPU: Core2Quad Q6600 2.4GHZ OC @ 3.4GHZ Mobo:MSI P35 Neo2 FR Ram: 2 x 2GB Curcial Ballistix 850Mhz GFU: XFX 8800GTS 320MB PSU: SILVERSTONE ST50EF-Plus ATX 12V 2.2 500W Case: COOLER MASTER Centurion 5

12-26-2007, 12:28 PM	#3 (permalink)
blurblock Gold Member Join Date: Sep 2005 Location: Singapore Age: 19 Posts: 359	but the problem is i have to adjust the PCi express freq in order to pass 225mhz . i can choose from 100mhz - 133mhz there's no auto function . __________________ CPU: Core2Quad Q6600 2.4GHZ OC @ 3.4GHZ Mobo:MSI P35 Neo2 FR Ram: 2 x 2GB Curcial Ballistix 850Mhz GFU: XFX 8800GTS 320MB PSU: SILVERSTONE ST50EF-Plus ATX 12V 2.2 500W Case: COOLER MASTER Centurion 5

12-26-2007, 02:42 PM	#4 (permalink)
[-0MEGA-] Diamond Member Join Date: Nov 2004 Location: Concord, NH Age: 20 Posts: 27,082	100MHz is the default for the PCI-E bus, and it's odd that you need to raise it in order to overclock. The only time I would sya that increasing it becomes useful, is if you are running SLI/CF on a board which restricts the secondary slot to only 4x or 8x speed. __________________ Desktop // Laptop Core 2 Quad Q9550 @ 4.0GHz // Core 2 Duo P8400 2.26GHz Asus Rampage Formula X48 // Intel PM45 ATI 4870X2 2GB GDDR5 // 512MB GDDR3 9800M GTS 4GB (2x 2GB) DDR2 940 // 4GB DDR3 800 750GB SATAII w/32MB // 200GB SATAII 7200RPM Creative SB X-Fi Titanium Fatal1ty SilverStone 750W +12V@60A 3DMark06: 21391 // 9179

12-26-2007, 09:47 PM	#5 (permalink)
blurblock Gold Member Join Date: Sep 2005 Location: Singapore Age: 19 Posts: 359	but my mobo MSI 945P nEo2 F force me to increase then PCI Express freq in order to go pass 225MHZ . And its 100 - 133 NO AUTO function . So im wondering is it the mobo tat cause my overclocking to fail . ? __________________ CPU: Core2Quad Q6600 2.4GHZ OC @ 3.4GHZ Mobo:MSI P35 Neo2 FR Ram: 2 x 2GB Curcial Ballistix 850Mhz GFU: XFX 8800GTS 320MB PSU: SILVERSTONE ST50EF-Plus ATX 12V 2.2 500W Case: COOLER MASTER Centurion 5

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12-26-2007, 11:35 AM	#2 (permalink)
hermeslyre VIP Member Join Date: Feb 2007 Location: Portland, Oregon Age: 18 Posts: 4,973	The PCI-e bus speed and the FSB are usually not relative. Generally, people are advised not to attempt to overclock the PCI or PCI-e bus. All it does is increase bandwidth over that bus, and often, create system instability. In other words, little to be gained, and system stability to be lost. Overclock without messing with the PCI-e bus speed, yes.

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