Hey guys im new to overclocking and was looking to increase my cpu speed a bit. It is currently 1.8ghz and i was looking at increasing it to around 2.1ghz I was just wondering what settings i should use for optimum performance at 2.1ghz ? im still confused by what speeds to change my agp, pci and dram too, (im looking in EasyTune4 for these btw), in conjunction with an increase in bus speed. I would appreciate the help as i dont really understand the 1:1 ratio changes i keep reading about with relation to the fsb and ram speeds? Any tried and tested setting for 2.1ghz mark on the amd 64 3000+ 939 would really help me out. thanks guys, cam

Don't overclock using EasyTune...overclock thru the BIOS. Here's what you'll need to know... Since the memory controller is built into the CPU & not the motherboard, the A64 doesn't have a FSB...instead, it uses a "HyperTransport bus". The HT bus is the product of the CPU frequency (200MHz default) x the HT multi. The default speed for the HT bus on a S939 system is 1000MHz (200 x 5) & it doesn't tolerate much overclocking. If you wanna overclock the CPU, you need to lower the HT multi to 4x, that way you can increase the CPU freq as high as 250MHz without overclocking the HT bus. And if you plan on raising the CPU freq even higher than 250MHz, you'd need to lower the HT multi to 3x. The 1:1 CPU:DRAM ratio isn't as great a concern on an A64 system as it is on an AthlonXP or P4 system that uses the "conventional" FSB. If you can do it, great...if not, you won't take a huge performance hit. A ratio of 5:4 will allow the CPU freq up to 250MHz & the RAM to remain at 200MHz or less. If your BIOS has the options, you should lock the PCI at 33MHz, the AGP at 66MHz, & disable any Spread Spectrum settings. And you *may* need to increase the CPU voltage (vcore) to stabilize the overclock. If you can pull all the above off, your CPU will be running at 2.25GHz. http://www.madshrimps.be/?action=gethowto&howtoID=58 http://www.dfi-street.com/forum/showthread.php?t=12960

So as my core cpu speed is 1.80ghz i should lower my HT bus from 9x to around 7x ?

"So as my core cpu speed is 1.80ghz i should lower my HT bus from 9x to around 7x ?" Don't get confused with all these difference multipliers & busses. Overclocking an A64 is totally different that overclocking an AthlonXP or Pentium. You didn't list your board make/model, so the BIOS may not use the same terminolgy that I'm using. Here's your default settings: CPU Freq = 200MHz CPU multi = 9x Resulting CPU Clock Speed = 1800MHz (1.80GHz) HT multi = 5x HT bus = CPU Freq x HT multi = 200 x 5 = 1000MHz CPU:DRAM ratio = 1:1 Resulting RAM Freq = 200MHz Overclock Settings: CPU Freq = 250MHz CPU multi = 9x Resulting CPU Clock Speed = 2250MHz (2.25GHz) HT multi = 4x HT bus = CPU Freq x HT multi = 250 x 4 = 1000MHz CPU:DRAM ratio = 5:4 Resulting RAM Freq = 200MHz

hi im trying to do the same but with a amd 64 3500+ and i can get it upto 216 fsb if i go any further i save the settings to the bios and when the pc reboots it says its running at 217, 218, 219, 220 whichever ive selected and then it just keeps rebooting. So any ideas what i need to change, ive currently got the following: CPU Freq = 216MHz HT Multi = 4x Ratio is 2:1.84 so ram is at 196 i think. CPU Voltage = 1.550 at 200mhz its 1.50 any ideas whats up also the temp is fine its running at 31c Thanks Mark AMD Athlon 64 3500+ sct 939 Gigabyte K8NXP-SlI Radeon X700pro 256mb 1GB Kingston value ram 3200 Audigy 2 ZS 200GB Maxtor SATA HDD DVD Rom

then how does the HT bus work if your HT is supposed to equal 2000mhz

"CPU Freq = 216MHz HT Multi = 4x Ratio is 2:1.84 so ram is at 196 i think" Actually, it's closer to 199MHz. Try changing the ratio to 2:1.66, then see if you can increase the CPU Freq higher than 216MHz. If possible lock the AGP at 66MHz, or if you have PCI-E, lock it at 100MHz. Always disable Spread Spectrum if you have the option. "then how does the HT bus work if your HT is supposed to equal 2000mhz" HT bus is like DDR (double data rate) technology...the speed is "effectively" doubled. The actual clock speed is 1000MHz, but it's effective speed is 2000MHz. You may also see it listed as 2000MT/s (Mega-Transfers per second). It's all the same thing....