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Old Aug 7, 2008, 09:44 PM   #105
Psychlone
AMD Overclocking Guru
 
Join Date: Apr 2003
Location: United States Searching for the airspeed velocity of an unladen swallow...
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Get ready, this is going to be a LOOONNNNG read!

OK... PRINT THIS - you're gonna need it!!!!!

I'd like to begin this thread with a disclaimer.
All hardware is different...2 machines with identical parts (even identical stepping on CPUs, etc.) will not overclock the same. There is no guarantee. You paid for parts that will perform at their advertised specifications, and what you're doing by overclocking is getting *more* than you paid for (hence the 'no guarantees' part.)
What may work for one individual may or may not work for the next...even given the same exact components...just always remember this...sometimes you have to settle for less than what you originally expected - the way to make it 'ok' in your head is to remember the 'no guarantees' thing...you've already got 'something' for 'nothing' if you've overclocked *at all*.

In overclocking, there are inherent risks. The very fact that you're playing with voltages and cycles translates into playing with fire - literally. More voltage = more heat. I can't stress enough the importance of proper temperature monitoring and some real good CPU cooling as well as excellent case cooling.

ASUS has a nifty little utility called PCProbe2 that comes on the CD that came with the motherboard... USE IT. I also found that CoreTemp gives a very close reading with the A8R32-MVP Deluxe.
If your temps at *any* time reach into the mid 50*C range, STOP and readdress your CPU and case cooling before continuing any further. (Mid 60*C is the upper limit, but we don’t need to push it, right?)

There are loads of good aftermarket CPU cooling options out there...I personally have the Thermaltake Big-Typhoon, and I'm very pleased with not only it's performance, but it's sound level as well. There are some good people whom I'm sure will chime in on this thread that have purchased the Tt V-1 cooler (uh erm...ProfBP ) - Apparently, this one-ups the Tt Big-Typhoon in cooling efficiency at the cost of just a db or two...indeed a very small price to pay for more than adequate cooling!

All in all, by the very nature of overclocking, you need to know that you're taking a risk of exposing specific components to more voltage/heat/cycles than they're designed to take, which *could* or *may not* lead to their early or eventual demise.

I'm sure most people that will read through all that crap already understand the risks...it's just pertinent for me to say...I can't be held liable for any kind of overclock gone wrong.

Alrighty then...

Some here's some terminology that we're going to be familiar with by the end of this post:

AMD's HT: HyperTransport (HT), formerly known as Lightning Data Transport (LDT), is a bidirectional serial/parallel high-bandwidth, low-latency computer bus. The HyperTransport Technology Consortium is in charge of promoting and developing HyperTransport technology. The technology is used by AMD and Transmeta in x86 processors, PMC-Sierra and Broadcom in MIPS microprocessors, NVIDIA, Via, SiS, ULi/ALi, and AMD in PC chipsets, Apple Computer and HP in Desktops and notebooks, HP, Sun, IBM, and IWill in servers, Cray in supercomputers, and Cisco Systems in routers.

HyperTransport runs at 200-1400 MHz (compared to PCI at either 33 or 66 MHz). It is also a DDR or "double-data-rate" bus, meaning it sends data on both the rising and falling edges of the 1400 MHz clock signal. This allows for a maximum data rate of 2800 MTransfers/s per pair. The frequency is auto-negotiated.

HyperTransport supports auto-negotiated bus widths, from 2 (bidirectional serial, 1 bit each way) to 32-bit (16 each way) busses are allowed. The full-sized, full-speed 32-bit bus has a transfer rate of 22,400 MByte/s, making it much faster than existing standards. Busses of various widths can be mixed together in a single application, which allows for high speed busses between main memory and the CPU, and lower speed busses to peripherals, as appropriate. The technology also has much lower latency than other solutions.

So, in a nutshell, HT is the bandwidth used between your memory and CPU and the CPU and other peripherals. (this one never *needs* to be higher than 1000MHz in one direction (which is 2000MHz effective))


AMD's HTT: (HyperTransport Technology (HTT) - I know, confusing!!!) The A64 has no FSB (or Front Side Bus) as we know it. That's because the memory controller is built-in to the CPU rather than being on the motherboard. Basically, HyperTransport replaces the FSB.
So raising the HTT is how we raise the CPU cycles...it's the amount of communication a CPU can push in a given amount of time.


CPU Multiplier: The CPU multiplier is one way for processors to run much faster than the clock speed of the motherboard or RAM allows. For every tick of the front side bus (FSB) clock, a frequency multiplier causes the CPU to perform x cycles, where x is the multiplier.
For example, if the FSB has a clock speed of 200 MHz and the CPU multiplier is 10x, then the processor would run at 2.0GHz.
One downside of the multiplier is that it only increases CPU speed. In the previous example there is a multiplier of 10x, but RAM still runs at 200 MHz, so the computer can only access memory at 1/10th of the processor speed, 200 MHz, the speed of the FSB. Because of this, many overclockers prefer to have lower multipliers with higher FSBs.


Memory Divider: One popular way of overclocking your processor is to increase your FSB. This increases the processor bus, and memory bus equally. In the event that your processor still has the ability to increase in speed, but your memory is maxed out, you would use the memory divider to slow down your memory. Example: You want to run your FSB at 200Mhz, but your memory maxes at 100Mhz. Set the FSB to 200Mhz, and the memory divider to 1/2, and the memory will run at 100Mhz. (primitive example, but you should get the idea) – the point here is that running a memory divider *literally* runs your memory at a fraction of its original speed…this is a good thing as we’ll learn later.
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