A friend of mine recently purchased one of these suckers and i'm eventually going to help him overclock it and see what we can get for yeilds. Someone recently asked and got a responce of a pretty basic dummy proof tutorial on OCing these chips, but i remember it having info of the relation of HTing ratios to the FSB and core speeds. I have no prior experience with HTing and i was hoping to read up on this web page. If anyone know it could they please post it?
FX-53 Overclocking
- Thread starter AWhackWhiteBoy
- Start date
All Athlon64 FX processors are fully unlocked (AthlonXP, Athlon64, Opteron are NOT unlocked).
Nuff said.
Nuff said.
i'm aware,but there was options in the bios i'm un-farmilar with relating to the hyper transport percentages.
Hypertransport percentages are meaningless in the sense of the FX-53 being multiplier unlocked. In other words the FX-53 is based on 200 x 12 frequency (for 2400Megahertz) with the hypertransport frequency being 200 x 5 =1000ddr. You can raise the FX-53 multiplier to 200 x 13 to get 2600Megahertz (provided you have a jet screaming air cooled or water cooled or phase change system) while keeping the hypertranport frequency at the default 200 x 5 =1000ddr (remember only the new 939 pin boards and the new revision 754 boards have the 1000ddr hypertransport; the older have 800ddr hypertransport and in the case of the nf3 150 boards 600ddr upstream I believe]. The regular AMD 64's you can't do that because the highest multiplier is already set. For example, the AMD 3800+ is set at 200 x 12 = 2400. You cannot raise it to 200 x 13 in the bios like the FX-53 so you have to start raising the 200 part, which is the hypertransport base number. So you would then set your processor to, say 250 x 10 =2500 for an increase of 100Megahertz on the processor. Notice the multiplier went down from 12 to 10; that all AMD 64's can do (have to do) becuase of the Cool N Quiet feature. Now though you have another problem. The hypertranport is now running at 250 x 5 = 1250 (overclocked and goodluck with that) and since the memory at 1:1 is tied to the hypertransport frequency your memory is now running at 250ddr. ASSUMING YOU HAVE AN AGP/PCI LOCK (which you don't need on the FX unless you want to increase the memory speed; remember you just increase the multiplier while keeping the hypertransport at default) you would then set the hypertransport back to 4x to give 250 x 4 =1000 (once again in line with normal frequency) However, the memory probably still is not working (some people can get it to work at that speed at 1:1) so you have to adjust the memory percentage divisor from the hypertransport to the memory. So a 5:4 memory divisor will give you a 250 hypertransport and a 200 working memory frequency so ...
(Example) Overclocked AMD 3800+ = 250 hypertransport x 10 = 2500 raw Megahertz set to HTT 4 to give you a normal 1000ddr Hypertransport (250 x 4), at 5:4 hypertransport to memory divider to give you a normal 200ddr (PC 3200) memory access. 250 is the five and 200 is the 4 in the 5:4 equation
:beer::laugh::beer:[/quote]
(Example) Overclocked AMD 3800+ = 250 hypertransport x 10 = 2500 raw Megahertz set to HTT 4 to give you a normal 1000ddr Hypertransport (250 x 4), at 5:4 hypertransport to memory divider to give you a normal 200ddr (PC 3200) memory access. 250 is the five and 200 is the 4 in the 5:4 equation
:beer::laugh::beer:[/quote]
i know how to overclock 
is HT a new variable with OCing or is this just refering to the CPU FSB, not the rams speed?
is HT a new variable with OCing or is this just refering to the CPU FSB, not the rams speed?
AMD has no frontside bus on their 64bit cpu's HTT is variable or not depending on the the cpu model and what you are doing. If you know how to overclock an AMD64 that wouldn't be a question. Hypertransport is the frequency at which the point to point bus that AMD and the Hypertransport Consortium created runs. It connects the cpus (multi cpu systems) and the north and south bridges. Re-read the post above because it explains how HT ratios affects ram speed and agp/pci speed (why you need a locked motherboard)
HTT does not refer to ram, frontside bus, or cpu speed but is the base frequency upon which all those things depend
Remember there is the HTT and there is the multiplier x base HTT frequency to give you Processor frequency
i.e. 200 x multiplier of 12 for 2400 for FX-53
Normal HTT for FX-53 939pin is 200 x 5 = 1000ddr for effective 2000 Normal multiplier is 12
Normal HTT for memory controller speed is 200 same as the number above at 1:1 at PC3200 speeds
Raise HTT to 250 for example givesyou 250 x 5 =1250ddr HTT for effective 2500ddr (not going to work)
Lower HTT ratio in bios to 4x from 5x (200 x5) to give you base of 250 x 4 =1000ddr (notice the same as 200 x 5 = 1000
HTT at 250 now raised the memory speed to 250ddr. Not going to work at 1:1 for most AMD boards at PC 4000 speeds
Set the memory divisor off the HTT of 250 (which you increased) to 5:4 ratio in bios and now your memory is now running at PC3200 or 200ddr speed the normal speed of the AMD 64's
4
HTT does not refer to ram, frontside bus, or cpu speed but is the base frequency upon which all those things depend
Remember there is the HTT and there is the multiplier x base HTT frequency to give you Processor frequency
i.e. 200 x multiplier of 12 for 2400 for FX-53
Normal HTT for FX-53 939pin is 200 x 5 = 1000ddr for effective 2000 Normal multiplier is 12
Normal HTT for memory controller speed is 200 same as the number above at 1:1 at PC3200 speeds
Raise HTT to 250 for example givesyou 250 x 5 =1250ddr HTT for effective 2500ddr (not going to work)
Lower HTT ratio in bios to 4x from 5x (200 x5) to give you base of 250 x 4 =1000ddr (notice the same as 200 x 5 = 1000
HTT at 250 now raised the memory speed to 250ddr. Not going to work at 1:1 for most AMD boards at PC 4000 speeds
Set the memory divisor off the HTT of 250 (which you increased) to 5:4 ratio in bios and now your memory is now running at PC3200 or 200ddr speed the normal speed of the AMD 64's
4
"AMD has no frontside bus on their 64bit cpu's"
that just made it click,i forgot about the lack of north bridge. so basically HT is just the replacement for FSB. thank you for you help
that just made it click,i forgot about the lack of north bridge. so basically HT is just the replacement for FSB. thank you for you help
No, there is a Northbridge. That is what HTT is for, to connect the cpu(s) to the Northbridge. The Northbridge just no longer house the memory controller!
Unless of course you get a one chip solution motherboard where the north and southbridge are combined into one unit!
yea, i have just such a unit. its a POS.
one chip, north and south bridge, onboard video,ethernet,and sound. sllooowww
one chip, north and south bridge, onboard video,ethernet,and sound. sllooowww
Wait until you get a load of that FX-53. That is my next chip here soon along with dangerden watercooling and a raptor and my x800xt all overclocked.. If you have any more questions about the AMD 64 ask; I am pretty up on them.
Hey how is that system if you have built it. I am going to be building the same system in about 1-2 months. I was wondering about your suggestions on components like RAM and such since you seem to know alot about the AM64 FX chips... all that was new to me about the overclocking. I have been reading up on overclocking for a while but haven't found much in the line of FX based tutorials... do you know any?
In my testing with my 3500+ the HT multi makes no real difference when set at 4 or 3 as far as benches go. As soon as you take the FSB above 200 with a 5x HT it becomes unstable. I run 255 x 10 with a 3xHT prime stable. I can run 4xHT but it wont prime and benching scores are the same.
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