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| Thread ID: 50736 | 2004-10-30 07:51:00 | How to change FSB:PCI ratio? Oh and AGP too | george12 (7) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 286328 | 2004-10-30 07:51:00 | Hi there. I have a Celeron D 2.4GHz cpu, about 2 weeks old. I have it overclocked, running at 3.06GHz (170MHz fsb). The DDR ratio is set at 1:1, so my DDR400 ram runs at 170MHz = DDR340. But I can't seem to find a way to change the PCI ratio. It seems locked at 4:1, ie. 133MHz FSB = 33MHz. So when I change the FSB to 170, the PCI is at 42.02MHz, when it could be at 34MHz if I could change the ratio. Same thing with AGP, it's running at 84MHz (shows in software as 336MHz but I think the integrated graphics is AGP 4x so it works out). So how can I change these two? I have looked everywhere in the BIOS, and besides I know it must be possible because if you stick in a P4 with an 800MHz FSB it will run the PCI with a 6:1 ratio. Thanks, George |
george12 (7) | ||
| 286329 | 2004-10-30 07:52:00 | Oh and BTW, if I run it past 3.4GHz it just instantly reboots. But that's not really the point, it's more that I would like to protect my precious PCI and AGP stuff. | george12 (7) | ||
| 286330 | 2004-10-30 07:56:00 | might depend on what mobo you have... the feature is in the bois and you can lock the agp and pci speeds, not sure how it exactly worded/looks like cos i dont have that feature :( so hence no oc for me :( |
Prescott (11) | ||
| 286331 | 2004-10-30 08:13:00 | Well, I don't seem to have it either. But surely there is some way that it could be changed. For example, the same thing that makes it decide whether you have a 400, 533, or 800 MHz FSB CPU could surely be changed somehow? Some expert here must know I'm sure. George |
george12 (7) | ||
| 286332 | 2004-10-30 08:19:00 | For example, the same thing that makes it decide whether you have a 400, 533, or 800 MHz FSB CPU could surely be changed somehow? I wld say this would be in the code of the BIOS. If the mobo and CPU match it would change things in the BIOS. eg: For HT if the speed of the CPU is the right speed for HT, the BIOS will give u the option of enabling/disabling HT. If NOT then the BIOS wont give u the option for HT. |
Spacemannz (808) | ||
| 286333 | 2004-10-30 21:42:00 | say if there was a BIOS update, would this unlock new features? like overclocking features or the pci/agp lock? | Prescott (11) | ||
| 286334 | 2004-10-30 21:55:00 | Try hitting Ctrl-F1 when in the BIOS main menu and you might get some advanced options. I know this works in my MB and BIOS. The change might not look like anything happened but check out the sub-menus and see if it opened any new doors. | Big John (551) | ||
| 286335 | 2004-10-30 22:25:00 | In my BIOS there is no option for locking - the AGP and PCI bus speeds are just locked by default - overclocker friendly :D There is an option for memory speed which translates to FSB:DDR ratio though. I was overclocking with an old board with unlocked AGP and PCI and never really got any major issues - only thing was AGP card rebooting system if the CLOCK rates were adjusted too high... I suppose its just a matter of luck and the amount and price of AGP and PCI devices in your system... your decision. Go get a overclocking mobo if you concerned or run at stock speeds! |
HadO (796) | ||
| 286336 | 2004-10-31 08:30:00 | > Try hitting Ctrl-F1 when in the BIOS main menu and > you might get some advanced options. I know this > works in my MB and BIOS. The change might not look > like anything happened but check out the sub-menus > and see if it opened any new doors. i dont think this worked for me, i was hoping to have some oc features but i cant seem to find it......... |
Prescott (11) | ||
| 286337 | 2004-10-31 19:33:00 | Ctrl + f1 only works on Gigabyte boards, they hide all the settings that allow you to damage your hardware. george if your BIOS doesnt allow you to set the PCI/AGP frequencies then there ant alot you can do. Possibly look for a 3rd party BIOS but with a motherboard as obscure as yours its like looking for a needle in a haystack. You could learn how to code your own BIOS and then modify the BIOS yourself, but the chance of the motherboard even being capable are slim. I hate to say it but you get what you pay for. Theres a reason overclockers buy the more expensive boards. |
Pete O'Neil (250) | ||
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