![]() ![]() In our experience, you’d do well to leave the manual Bios settings alone and stick to the Auto settings that have been created by the motherboard manufacturer. If you work very hard indeed at overclocking a Penryn processor on P45 you will get the same results that you can achieve in a matter of minutes on P35, which doesn’t sound like much of a deal. With P35 you want a ratio of 0.61x-0.67x with 0.62x as an ideal, but with P45 the range is 0.37x-0.76x and 0.67x is ideal for a Penryn processor. The third area to consider is the northbridge GTL reference voltage measurement figure. As the clock speeds increase the waves become less precise but more voltage rectifies the situation. With P35 you need to increase voltage to keep the clock wave signals strong to maintain system stability. That would sort out the stability and allow you to raise clock speeds further without any risk of damage to the processor or motherboard, which is pretty much the ideal situation. With P35, it was a doddle to overclock your Core 2 processor as you could crank up the FSB until it got flaky then you’d raise the CPU core voltage by 0.1-0.2V and pump about 0.4V extra into the northbridge and CPU VTT settings. We’ve worked with a number of P45 motherboards and have come to the conclusion that it is more sophisticated than P35, which manifests itself in some re-jigging within the Bios that takes effect when you overclock your PC. #Intel r g45 g43 express chipset overclock full#We know full well that Penryn will have reached the end of the road at top-of-the-line CPU as soon as 'Nehalem' - aka Core i7 - is launched in conjunction with the 5 series of chipsets, so you might be wondering what’s so great about the P45. ![]() For that matter, P45 doesn’t add support for a new FSB or memory speed. That’s enough bandwidth to run CrossFireX with a pair of dual-GPU graphics cards - which is handy, as AMD has recently brought out the ATI Radeon HD 4850, 48 X2.Īlthough the PCIe support offered by P45 is a welcome enhancement over P35, it’s not as generous as the dual 16 lanes you get with X38 and X48. The most visible change in P45 lies in the PCI Express support for graphics as a single graphics card will run on 16 lanes of PCIe 2.0 while two ATi graphics cards in CrossFire will get eight lanes of PCIe 2.0 each. This is a bit of marketing nonsense as the Asus P5E3 Deluxe mentioned above also supports the QX9770, although it does it without official say-so from Intel. In fact, it's exactly the same as X38 with the addition of support for a 1600MHz frontside bus which is only used on the Core 2 Extreme QX9770. That’s easy enough but then we come to X48, which sounds as though it ought to be the first of the 4 series of chipsets. It increases graphics support to 16 lanes of PCIe 2.0 and these are divided equally between the two slots if you’re using CrossFire. ![]() The X38 chipset is a variation of P35 that allocates PCIe more efficiently to the graphics. ![]() If you’re using a PCIe RAID card or sound card that’s fine, but if your motherboard supports CrossFire, the second graphics slot only has four PCIe lanes to work with. P35 has a total of 20 lanes of PCI Express (PCIe) 1.1 with 16 lanes for the primary slot and four lanes for everything else. MSI's P43 Neo: based on a pared-down version of the P45 ![]()
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