Guide to overclocking the A64
Hello mate. Yeah clockgen was handy for me too. BTW I broke 21k now <A HREF="http://service.futuremark.com/compare?2k1=7584476" target="_new">http://service.futuremark.com/compare?2k1=7584476</A>
<A HREF="http://service.futuremark.com/compare?2k1=7584476" target="_new"> My rig </A>
UPDATED 28th November 2005! Top downloads at bottom!
Look at the bottom of this post for older S754 overclocking.
This guide includes overclocking of the new opteron chips that are currently in the headlines. Here are my findings:
Good clocking cpu's are 144,146 and 148 opterons. Try and get an 0540 one if you can!
Corsair 3500LLPRO PC 3500 2x1gb is amazing memory. Can run 220mhz 2-3-2-5 timings and upto 250mhz 2.5/3/3/8!
Freezer 64, SLK 90 and 120 are top air coolers!
Opteron 144 CAB2E 0540 FPMW
Freezer 64 cooler
DFI NF4 Ultra D latest bios
2x512mb OCZ pc3200 EL 2/3/2/6 @ 2.5/3/3/6
Make sure to keep processor temperatures under 55C! Speedfan is good for monitoring.
First off I purchased the processor second hand pre tested @ 2.8ghz 1.44v so I lowered the ram:HTT ratio to 7:10 and the HTT ratio to x3.
This means that because I know the memory can do 230mhz (tested in an older motherboard) I can reach a theoretical 329mhz HTT before I encounter ram limitations. 329/10x7 = 230mhz.
Now I set the HTT to 300 in the bios, cpu voltage to 1.47 (actual is 1.44) which gives me 300x9 = 2700mhz. Windows boots fine as I know the HTT and ram are ok and the cpu has been pre tested to 2.8ghz but I am trying 2.7 just to be safe.
I use clockgen for NF4 to raise the HTT 2mhz at a time then run prime95 for 20 minutes and if it passes I raise the HTT again until it fails.
I reached 313mhz HTT and 2817mhz before prime failed at the 15 minute mark. Dropping the HTT back to 311 gave me a prime stable CPU.
To test the memory for its max overclock - I suggest using these settings:
200mhz HTT x3 = 600mhz
1:1 memory:HTT ratio
This way the memory can be overclocked with clockgen without the cpu reaching 2.8ghz because the memory would need to do 311mhz 1:1 which is pretty impossible unless you are using PC 4800 memory or similar.
If you have good memory that you think will reach over 300mhz then set the CPU multiplier to x7.
Overclock using clockgen 2mhz HTT at a time or more if you feel brave until prime95 will not pass 20 minutes. This should give you your max memory overclock.
Lets say the memory ran ok at 235mhz. We know our CPU ran ok at 2.8ghz so we can now use 311x9 = 2799mhz with a 3:4 memory:HTT ratio (or 150mhz setting).
Here are my results.
You can also mess about with the max HTT speed by lowering the cpu multiplier to 7 and ram to 1:2 and see how far the HTT will overclock.
Heres a guide to memory:HTT settings.
Ratio / HTT@200mhz/300
1:2 = 100mhz/150mhz
3:5 = 120mhz/180mhz
2:3 = 133mhz/200mhz
7:10 = 140mhz/210mhz
3:4 = 150mhz/225mhz
5:6 = 166mhz250mhz
9:10 = 180mhz/270mhz
Hope this helps!
PART 2 - 2-13-04
This is the old guide for S754 overclocking!
I think this guide is essential as a lot of people will be asking how these new chips from AMD overclock. Heres a guide on how to go about it and an ideal setup to achieve top results. I will be focusing on the 754 single channel processors.
First off some information on the Athlon 64.
The A 64 3000,3200 and 3400 come in socket 754 configuration and only work with 754 motherboards. The 3200 and 3400 have 1mb of cache and the 3000 has 512kb of cache.
All the socket 754 cpu's have an onboard single channel memory controller to reduce latencies and increase performance. Being single channel the 754 processors do not need 2 sticks of memory for maximum performance.
An ideal list of components to achieve top results.
One thing to keep in mind is that the N-force 3 and Via K8T 800 motherboards do NOT have a lock on the pci bus. The N-force 3 boards do have locked AGP and a few of the VIA motherboards do aswell.
Overclocking an Athlon 64 is not going to be as easy as overclocking an Athlon XP or Pentium 4, but with a bit of luck it should yield good results.
The memory needs to be capable of upto 230mhz FSB so some good quality PC 3700 memory will suffice. Choosing the motherboard will depend on what 3d card you have and how far you intend on taking the overclock.
For all Nvidia owners, any motherboard will do for overclocking, especially the ASUS, Gigabyte and MSI boards.
If you have a radeon you may well want to go for a board with locked AGP bus to keep stability at 220mhz fsb. My 9700pro does 216mhz fsb fine but it may start to become unstable over this speed. An N-force 3 chipset motherboard should be used here if possible for 220mhz and over fsb overclocks.
The choice of processor is up to you. The 3200 and 3000 processors are multiplier locked to 10 so for whatever FSB speed you do achieve, multiply that speed by 10 and thats the maximum processor speed. For e.g my MSI motherboard based on the VIA K8T 800 chipset (no locked agp or pci bus) runs at 213mhz fsb stable which gives me a total overclock to 2130mhz from 2000mhz (213x10=2130mhz).
For a higher cpu speed a 3400 has the 11 multiplier to and in my motherboard would be doing 2343mhz instead of 2130mhz of my 3200.
Cooling is not really a problem as the stock cooler keeps an Athlon 64 cooled to 35-45C on average.
Heres a good budget overclocking setup.
A 64 3000 with stock cooler
512mb twinmos 3700 memory
Asus K8V Via motherboard
This setup will hopefully acheive 220mhz fsb.
The ideal overclocking setup
GIGABYTE GA-K8N PRO
Corsair PC 3700 memory
With a bit of luck 225mhz fsb + and 2.46ghz cpu speed can be achieved.
Final tips for overclocking.
A good way to start overclocking is to download clockgen for your Athlon 64 motherboard. With this you can overclock the FSB in windows, run PRIME95 and 3dmark 2001 for a few hours and then up the FSB some more. Once you have achieved a stable overclock, go into the BIOS and enter the FSB you achieved.
To achieve a higher FSB you may raise the VDIMM (memory voltage) to 2.75V and lower the CAS (memory timings for advanced users only) to 2.5 or 3. Return to windows and try to overclock more and see if its stable.
Clockgen lets you lower the multiplier of an Athlon 64 so that you can run a higher HT (FSB) speed. For exmple I changed the multiplier to 9.5 and managed to raise the HT speed of my athlon cpu processor to 222mhz, but the AGP bus was too high for my 9700pro so it was unstable.
I found that lowering my DDR speed to 333MHZ in the bios let me reach a high FSB speed and an overall faster system. I managed to get my HT speed to 231mhz prime and 3dmark stable which resulted in a cpu overclock of 309mhz from 2000mhz to 2309mhz. 3D mark 2001 proved this speed (231mhz HT, 2309mhz cpu speed and 192mhz memory speed)to be faster
than 215mhz HT, 2150mhz cpu speed and 215mhz memory speed.
I stole this one from Anandtech for s939 OC 8O 8O
Overclocking breaks things which you alone are resposible for, not AMD, not intel, not Nivida, not Ati, not xyz mobo maker. Proceed at your own risk.
this is a quick and dirty guide. I am aiming for simplicity since it's not all that complicated to OC A64's even for first timers. I am also aiming for safty so you don't kill anything so lower volts are advocated. Just good clean fun to get an FX or better from your budget chip.
VERY IMPORTANT to keep in mind at all times is hypertransport needs to be around 1000, meaning LDT x HTT (aka FSB) ~1000 or less.
Now we will Isolate then Consolidate.
What that means is you need to test three parts of the CPU subsystem (chipset, chip, and memory) to find max speeds of each.. Then combine them for some sort of optimal overclock.
Don't forget to take notes.
1. Max HTT/FSB should be first ..*only works if motherboard has locks. Most A64 boards do today. Sata 1 and 2 are not locked on some nforce mobos use 3 and 4.
-set CPU multi to 6 or 7, this will take CPU out of equation
-set memory to SPD and 100, this will take memory out of equation
-Increase HTT/FSB up until you fail to boot or there abouts, back down 5%, (HTT * 0.95), this is your max safe HTT.
2. Max Chip capable
- Set multiplier to it's maxium
-Set vcore to 1.6 -1.65 for 130nm chips, 1.50-1.55 for 90nm chips
-Set mem to SPD and 100, this will take memory out of equation
-starting with HTT 200 raise in about 5Mhz increments up to boards max found earlier or until you start failing PRIME95 which will probably happen first..only give it 5 minutes max, that's good enough for now.
-At the point it starts failing within that 5 min time period, back down 5%, (CPU MHZ * 0.95), thats your max CPU speed, now test prime again at 95% for 12 hour for stable.
Prime 95 Link http://www.mersenne.org/freesoft.htm
3. Memory MAX
It depends what you want and type of mem you chose, LL or Bandwidth but must keep 1T (command rate) because A64 suffers big time with 2T.
-For high bandwidth set mem setting to 200 and 2.5-4-3-7 1 T and give it boards max volts, or for LL set mem setting to 200 and 2-2-2-7 1 T and give it boards max volts. (up to 2.9Vdimm is safe with all ram) ( Caution DFI/ABIT users -- do not exceed 3.0V unless you know what you are doing!!!)
-Set CPUs multi to 6-7, again to take it out of equation.
-Raise HTT up to boards max or until you start failing memtest86 test 5 and 6 http://www.memtest86.com/
-When you start failing memtest86 test 5 and 6, back down 5%, (HTT * 0.95), thats your max MEM speed.
The most important thing to keep in mind is CPU Speed is king. So now that you know your CPU speed from above, use it. Say it's Winchester 3000 and it's 2650Mhz prime stable and with it's 9 multiplier it needs 295 HTT to get there (9x295=2650)...NP right, but you got some value ram which only clocked to 210Mhz from your above testing. Well obviously you can't run the ram at 1:1 which would be 295Mhz, you must use a mem divider. You can use the memory divider (mem setting) to get as close as possible to your mem max found above.
This is the rough way to calculate IE close enough..
200 = HTT Mhz
183 = HTT x .90 = Mhz
166 = HTT x .83 = Mhz
150 = HTT x .75 = Mhz
133 = HTT x .66 = Mhz
100 = HTT x .50 = Mhz
What can my 210Mhz memory run in this config?
295 x .83 = 244 = not a chance
295 x .75 = 221 = not quite
295 x .66 = 195 Yes, but slow.
You have two choices, try and tighen timings and run 195 which is perfectly OK choice. Or Change CPU multiplier and start over. Ideally you want for max CPU and memory to coinside...Does'nt always work the way you want... My Ballistix below is 245Mhz stable but I'm running less for more CPU speed which always wins. You should too.
To help you along in the "consolidate" phase user Gogar has made a niffty script found here.
Just put in those maximuns found under the "isolate" phase and it will spit out the best choices.
After you go though these steps , take notes, you'll become more familiar with the whole tweaking process (learn by doing) and will be able to dial in better frequencies, timings, voltages, and faster too. But this should get you pretty close to safe and optimal speeds
UPDATE: Dual core CPU stability testing
X2 is not any different than a single processor overclocking but for volts and when prime testing CPU(s) for stability:
Volts should not exceed 1.45 for safe operation!
1. Make two folders with Prime95
2. Starting two instances: Launch both instances from each folder and choose: torture test > small FFT's > click OK.
3. Next, launch taskmanager and set affinity of the first instance of prime to CPU 0 only. The other instance of prime to CPU 1 only.
When OCing AMD64s you don't need any special memory since running the CPU and memory async won't effect performance. Although CL2.5 is recommended since you get more space when changing the memory dividers. But according to me it's a waste of money in buying memory anything faster than CL2.5.
I think this is very important to mention. You make people believe they need some expensive memory to OC when they don't. To most people OC is getting most bang-for-the-buck and then you don't want to waste money on unnecessary components.
BTW last time I checked tRAS 10 was optimal AMD64. You are running tRAS 6...
Perhaps you can provide a few pointers about OC'ing my rig.
AMD64 3200+ Venice, MSI NEO2 Platinum, Antec TruPower 550 in P160 case, Micron Ballistix PC3200 512MB x 4 (2GB) single sided @ 2-2-2-6 1T, bios settings: mem clock = 200, HTT@5x, CPU email@example.com, firstname.lastname@example.org
Rig runs great at these "stock" setting, but when reducing CPU multiplier and HTT while clocking mem @245 the system boots, gets super Sandra BM numbers, but all swe runs like a slug moving through snow. Bottomline, when OC'd to 2.4GHz da' SOB runs, but it's a super pig.
Any useful advice will be greatfully received
Eh that's not true...you have to go 30mhz higher (or thereabouts) on the fsb to = the same amout of power* from the cpu. I can provide some linkage if you'd like. Also, 7-8 (edit: Ok...i just read in 3 different places on Anon's site alone, where one article said 6 was best, one said 7-8 were best and 2 said 10 were best...the 10's were in regard to 754 and 6-8 were in regard to 939...so my apologies for jumping on u for that) has the most throughput with tccd ram, for whatever its worth (on 939 Win's and V's...i haven't checked against my Manchester yet tho; thats using SiSoft...i have some ch ram (hyperX) i can check against too if u like (i have a 2gb kit too...but while it oc's well it is kinda outside the rules, but would be happy to chk it too)).
Either way with the bandwidth, it makes a very small difference. But the 1:1 vs divider is a no-brainer, i can easily back that up with bench after bench. Look up apesoccer on Futuremark's site...i probably have 300-500 benches stored. Maybe 30-60 specifically to a64. Mostly 1:1, but i have a few 400:333's stored there throughout the suite. I can provide linkage from anan's site as well, where they tested 1:1 vs divider, where 1:1 won every single time.
What doesn't matter is using a + divider, running the ram higher then the fsb. That's probably what you were thinking of.
*-power being defined, in this instance, as the ability to do work.
Here are a few of my links collected...
Well here is my results so far:
Amd 64 4400+ 2.2 ghz 2mb cache 939
OCZ pc4000 3-3-2-8 standard one chip is down, so i run at a single 1gb till i get one back from ocz
Timings @ 564 mhz is 3-3-2-5, which is indeed incredible actually.
I made some adjustments to the fsb mem ratio to something cant remember what 16666667% over fsb or something in that direction got a 450 mhz overclock fine, till one core overheats due to waterblock abit, not in right place, and no coolingpaste.
Not dissapointed at all at amd systems in oc: theese are the overclocked systems i have built
Abit nf-8 a 64 3000+ 512 cache 754 @ 245-255 fsb, depending on outside temperature, (very high i guess)
Dfi lanparty-ut nf4 sli
a 64 939 3200+ 400 mhz overclock not 1 bluescreen in 2 years now (corsair memory pc3200 cl2 memory)
Dfi lanparty-ut nf4 sli a64 3700+ @ 300 mhz oc 2 years no bluescreen (0.25 v+ cpu)
heloo!!!just register on this site.my english is not so good but i hope so that you will understand me.I have MSI K9N neo AND OPTERON 1210.I flashed bios with msi 570 ultra before one our and its working.could not get more than 2150 on stock bios.Now i am on 2600.Cant find the site where someone said that msi platinum bios is better because detection of cooler rpm is ok.Can someone tell me what version of platinum bios is.I would like to flash again.
Problem overclocking my Opteron!!! I have an Opteron 165 1.8 Ghz. I used to overclock it up to 2.7 Ghz and the performance was GREAT!!! I had 2*512DDR400 PQI CL2.5 double-sided. All i had to do was to decrease HT speed from default to 4x, decrease from DDR400 to DDR333 and increase the FSB.
Now, I bought 2*1GB Kingston pc3200-KVR400x64c3a CL3 and sold the old ram....problem is that the new ram doesn't let me put the frequency to DDR333...only DDR266.the CPU runs fine at 2.7 Ghz...but performance is barely at 8%....how stupid of me to sell my old ram
Can someone PLEASE tell me settings to apply with the new ram?....there must be a possibility to get performance with my new ram.
Thanks in advance
How to overclock Phenom 9750 2.4Ghz using Motherboard A-Bit A-S78H ?
Processor : Phenom 9750 2.4Ghz (12x multiplier max, FSB 200)
Mobo : A-Bit A-S78H
Ram : 8GB Corsair DDR2 PC8500 XMS2
Graphic Card : ATI HD2600XT GDDR3
System : Windows XP64
All I already to do is increase the FSB to 202 (Very little) and cannot boot. other bios setting is default, i changed only Ram Voltage (2.1 volt) and 4-4-4-12 as factory suggest.
Note: many setting in A-bit A-S78H for overclock.
I'm newbee,and thanks in advance for anybody can help me to overclok my PC.
I was trying to get through the detailed on over clock. As I am very new to this concept unfortunately. I had to quest to optimized my PC to perform better in terms of playing high end games and I found this great concept of over clocking. I really appreciate if you can tell me step by step to over clock the AMD processor.
Details are provided below:
Processor: AMD Athlon 64x2 4000+
MOBO : Asus M2N- MX - SE EDITION
customed CPU cooler: Cooler Master Hyper 212 EVO Cooler
Ram : Transcend 2x2 667 =4GB
GPU : NVIDIA GT520 2GB DDR3
Now As I checked while playing a high end games (BF3) that CPU is hitting to 55 degree temp,
Now I have a request that to what level I can over clock it? to my understanding if I can hit safely to 2.7 GHrz/ core. it seems to be fine for me.
Can you kindly let me know what I should install as a software( Like I have installed CPUZ to monitor details of CPU) and where to go and what changes I need to make it to have a safer level of Overclocking with my system Configurations.
I really had a good trust on your detailed post. so I am asking. I hope you would take a time to help me out. I am pretty excited to have my system performing at higher level.
Please let me know. Best Regards