Athlon 800 and 200 Mhz FSB

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Valek_Hawke

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Jun 8, 2001
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Okay, I know that many of you reading this are probably rolling your eyes now and saying Awww Jeeeeeeze!!!, but I am VERY new to overclocking and some of the terms, etc are new to me. After reading some of the posts here I hope I can get the benefit of your experience. It seems that I see the Bus speed of 133MHZ quite consistently. I just bought an Asus A7V and an AMD Athlon 800 Socket A with a 200 Mhz FSB. What is the difference and will this affect trying to overclock it to 1 Ghz as outlined in Tom's Article "Building Your Own PC" on his Home Page. What are some things I need to be aware of, study up on, pay attention to, etc? I hate to sound stupid amongst so many knowledgeable people, but I want to do this right. Thanks in advance.

Valek

Val
 
They all lied to you. Your processor only has a 100MHz FSB. 200 is an inflated number meant to represent the DDR value, since it uses a DDR bus. So it's actually 100MHz x 2 instuctions per cycle.
Now, the 133 really is 133, but is also called 266. You can obviously see where this is going.
So I would go ahead and try setting the motherboard to 133, which would give you 133x8=1066 (computer math, 133.33333..).

Cast not thine pearls before the swine
 
Thanks Crashman for the info...which now brings up another question...if I set the bus to 133 then don't I have to pay attention to the PCI bus to make sure it doesn't exceed....I think it's like 33 mhz....? Still learning here so please bear with me. So if that's the case then I have to set the multiplier to 1/4 for the PCI bus. Is that done in the BIOS or is that a jumper setting on the motherboard itself? (Asus A7V)

Thanks Again for all your help.

Val


Val
 
This is not fair ,u know, I have exactly the same things as u do (A7V and 800Mhz Athlon) and I can't even reach 101Mhz bus!!!! why is that??? what RAM do u have? pc133 CAS2 or CAS3?
 
Manarch,
In actuality I have not received the motherboard or the processor yet. I'll be running PC 133 RAM, but as far as CAS I still need to learn about that one yet. I am trying to read as much now and get as much insight as I can before the board and processor arrive and I start putting it together. As I said, this is my first venture into the world of overclocking and I don't want to ruin anything and have as few glitches as possible. I saw the clock settings on Asus' sight which showed a bus speed of 133 with the PCI bus at 33.33 mhz, but you say you can't achieve that? Now, please don't think I am in any way being presumptious but are the L1 bridges closed on your processor?...Which btw...brings me to another question...If I use a pencil to close the L1 Bridges...won't the addition of thermal compound such as Arctic Silver possibly smear the lead and cause there to be contact between the individual L1 Bridges? Also, I have heard that you can get a pen that electronics techs use to close circuits...has something like liquid silver or mercury or something or other in it...anybody know where I can get one? I've checked Radio Shack and online, but no luck yet.

Thanks again for all the help everybody.



Val
 
well, i think only FEW ASUS A7V mobos(u sure it is not A7V133?) will go 133Mhz. if u wonna o'clock everything so high - then go for pc150
 
You only apply the thermal compound to the die, <i>not</i> the whole processor, so it's not going to cause contact between the individual L1 bridges. The die is the greenish colored part on the middle top of your processor, and is the only part of the cpu that makes contact with the hsf. Well, the pad on each corner of the cpu also makes contact, but that is all they are: pads.
btw- you only need a small amount of thermal compound, too much actually begins to insulate- very bad!
btw part 2- your earlier comment about sounding stupid amongst so many knowledgable people? Welcome to my world! :smile:

My brain has performed an illegal operation and will be shut down
 
I have a A7V133 with a t'bird 800 @ 933 (7 * 133) globalwin fop32 at 1.85v. I have a gforce 2mx and sb live , ibm 30gig hd, generic network card. I have tried higher FSB but it was unstable. Many people have said the max could expect is 950 out of an tbird 800. so 1000 may be too much to expect.
 
Yeah Croaker I think you might be right. I think 133 FSB might be a little too much. I do distinctly remember in Tom's article that to reach 1 Ghz the FSB was left at 100 with a multiplier of 10 and he commented that it ran perfectly stable. I sure hope so as I'm already committed to the board and processor. But let me ask you guys...is ther really that much of a performance gain by going from a 100 mhz to a 133 mhz (if it's attainable) FSB or is it really worth the effort and headache?

Val

Val
 
You Know though Gamer, This intrigued me so I went back to Asus' site and on the A7V overview page it specifically says that it supports up to a 200 Mhz FSB. I guess I'll find out soon enough though. But now, lets just suppose that by some miracle I do get it above 100 mhz on the front side....doesn't that directly affect the RAM speed as well? Seems like I remember reading somewhere that it did. It's a shame that the A7V won't support DDR Ram...lol

Val
 
Remember that the 200mhz you're reading about is really 100mhz, just double pumped. Forgive me if you already understand this, but somebody here explained it this way: Imagine an old clock going tick-tock, tick tock. Now imagine you're having a conversation with somebody and you say one word on each "tick". In other words, you're speaking at a rate of 60 words a minute (since there would be 60 "ticks",or seconds, per minute). Now imagine you say one word on each "tick" and one word on each "tock". Now you've doubled the rate at which you're speaking to 120 words a minute. The clock isn't going twice as fast (i.e. 120 "ticks", or seconds, in a minute), you're doubling the rate at which you speak. The clock cycle of your cpu fsb can be viewed the same way. 200mhz is really 100mhz. It's just that the cpu processes a bit of information on each "tick" <i>and</i> "tock". The cpu clock isn't running twice as fast, just as the clock in the speaking example above isn't running twice as fast. Again, I apologize if you already understand this, but in your post it sounded like you're thinking you should be able to set the fsb to 200mhz.

My brain has performed an illegal operation and will be shut down
 
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