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3000+ Venice and Intel 630 help

thecoolnessrune

thecoolnessrune

Diamond Member
What can the 3000+ Venice hit on STOCK cooling??? On top of that, what memory would I have to use to keep the DRAM timings at 1:1? Same question for the Intel 630. What can it hit with stock cooling, and what memory is necessary to keep timings at 1:1?
 
Cheap Venice can hit anything from 2-2.6, depending on the chip. DRAM timings....using a 3000+, you'd have to go to over 270 fsb, so you're not going to get ram that can hold 1:1 timings at that speed.
No idea on the Intel.
 
ummmmmmmmm. I'm sorry. I'm terribly new to overclocking. I thought that the AMD processors didn't use fsb. At least, not the Venice core? Since it integrated anyways.
 
The Athlon 64's memory bus runs at twice the clock generator speed, effectively.
This is sometimes referred to as 'LDT', I believe. HTT runs at multiple of the LDT.
 
Originally posted by: thecoolnessrune
Oh. I see. Ugh, no I dont. I understand about the HTT part, but not about the whole HTT at 270Mhz thing. Since DDR400 runs at 200MHz, don't I just purchase a memory that runs at 300Mhz?? like DDR600 (PC4800)? like this one???

http://www.newegg.com/Product/Product.asp?Item=N82E16820227208
Click to expand...


It is unlikely that any MB could run memory at 300Mhz with a 1 to 1 ratio, The on die memory controler on the A64's could not handle much above 260mhz. I Think.
 
So if I run an AMD at 270Mhz then the memory bus runs at 540Mhz. Which would mean a memory of DDR 1080 at least. right? Which can't be done as 300Mhz is as high as DDR memory goes. Ok. I think I'm starting to understand all this. An Intel processor runs at the fsb x the multiplier. The bus of an 800Mhz Intel runs at 200Mhz. So a AMD processor runs at the HTT x the multiplier? And it is double pumped.
 
First off, the dividers don;t hamper the performance hardly at all on The AMD due to the integrated memory controller, so you don;t need to spend a lot of money on memory, just use a divider. The Intel is affected a lot more by dividers. What is it you are doing with this PC ? That would be a factor if you are deciding which way to go.
 
games. I dont even have the setup yet. Trying to determine what to buy. I do games, and audio conversion. No video editing, or anything like that. Just games and audio conversions. So I could even get like PC2100 memory, use a divider, and not even notice a difference???
 
At Stock a A64 3200+ runs

HTT (200) x LDT(5) x2= HT(2000)
HTT (200) = Memory at a 1 to 1 ratio
HTT (200) x cpu multi(10) = 2.0Ghz
or oc'ed
HTT (240) x LDT(4) x2= HT(1960)
HTT (240) = Memory at a 1 to 1 ratio
HTT (240) x cpu multi(10) = 2.4Ghz
or oc'ed more
HTT (280) x LDT(3) x2= HT(1680)
HTT (280) = Memory at a divider mabey 240 ish
HTT (280) x cpu multi(9) = 2.52Ghz

and so on
You should get PC3200 at least
 
I wouldn;t go that far, but you could use 2100. Usually the best is cheap PC3200 memory, and a divider to get up to 270-290, and with the venice, I think most people get 2.6 or better. Definitely forget teh Intel for your uses IMO.
 
Right, this how the K8 does its memory biz.
The memory controller is integrated onto the CPU die, and runs at the frequency of the processor itself. You'd think that this would seriously limit the Athlon 64's ability to clock high, but there are people on here hitting > 3.0GHz, so that doesn't seem to be the case.
The Athlon 64's memory bus runs at an effective speed of 400MHz, at stock, but is really running at 200MHz (remember the Athlon XP 3200+?).
This is not a 'Front Side Bus' in the traditional sense, as originally, the memory controller was integrated into the northbridge, between the processor and memory. Now, there is a direct path to the memory, unlike before.

So, how can Socket 939 Athlon 64s with an effective memory bus of 400MHz offer twice the theoretical bandwidth of the Xp 3200+?
Bus width.
The Athlon XP used a 64-bit memory bus, just like socket 754 Athlon 64s.
Socket 939 Athlon 64s use a 128-bit bus, or 16 bytes. Since this bus runs at an effective speed of 400MHz (at stock), it can utilise the bandwidth of two 400MHz-effective, 64-bit memory modules in dual channel mode.
You should therefore compare either the native speeds of both the memory bus and the memory modules you're using, or the effective speeds of these.
So in the case of a stock socket 939 Athlon 64 with a native memory bus speed of 200MHz, you want memory running at that native also, which is DDR400 ('400' refers to the effective speed).

If you are overclocking your Athlon 64 and want to maintain a 1:1 clock ratio between the memory bus and memory modules, make sure you take the above into account.
If, for example, you overclock your memory bus to 300MHz (or LDT as it is often referred to), you will need to run your memory at 300MHz, which means DDR600.
As many users have stated however, the huge reduction in latency afforded by the Athlon 6's IMC greatly reduces the need for high-performance memory.
You shouldn't worry about maintaining a 1:1 ratio when overclocking. Only at overclocks of > 3.0GHz will memory bandwidth become a bottleneck on the 939 platform.
AMD has an answer for this problem, however: DDR2.


 
Do the timing have to sync perfectly???? Like what if you overclock to 270Mhz. Do you have to match the perfectly with the timings offered by your Bios? Because if I'm understanding this correctly, that would mean a memory timing of 27:20. Which I'm pretty sure no Bios supports. Also, which is more important? Getting as high a memory as possible to get as close as possible, or just using 3200 and using dividers to get things even?
 
The whole mhz rating of memory isn't as important as memory timings. Just use a DFI motherboard with VX memory, crank the voltage and run it at 2-2-2 with the best divider you can use without losing stability.
 
The most cost efective thing to do is use pc3200 ram. and use a divider to make it run at its max stable speed 200 Mhz'ish . If you get low latency Ram you can loosen the timeing and run at a higher speed. Not that there's much point to it.
 
Ok thx abunch. Another slightly off-topic question. Is there any way to unlock my Deel MOBO so I can overclock my 2.533Ghz P4??? I believe it uses an 845GV chipset.
 
very off topic
I'd start a new thread or no Intel guys will see your question

in addition to your agp/ pci lock you are going to watch your HT ratio 5x-4x-3x
and your memory ratio
and have your sata's in the right sockets
any of the above will prevent oc
do some research on you mothrboard

what the guys were trying to say was to get econo ddr 400 memory and then try and run it at just below or around it's rated specs
DDR 400 runs at a memory bus speed of 200 thats why it;s called double data rate
so if you oc your HTT (which is miscalled FSB sometimes) you have to use a divider
200:250 or 4:5 go over 250 and use 3:2 this keeps your memory in spec
300 cpu bus and 200 memory bus = DDR 400 pr pc 3200
different motherboards call this divider different things
some have more choices of ratios than others
check out your motherboard and forums
 
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