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Noob Question, Sorry Guy :p -FSB & Prime95

post #1 of 8
Thread Starter 
I want to OC more! Im currently sitting at 4.1GHz @ 1.45000v (48degree load) and 2800mhz CPU-NB @ 1.35v (as recommended on a 890fx chip). Have not prime95 tested this new setup but played lots of games with a noticable performance increase, specifically GTA IV (up to 20fps )Now im looking at FSB or HT link.

For the FSB is it CPU dependant or mobo? I have a good $200 mobo and i bought it anticipating both the BD release and the decent OC abilities. Im running a stock 200mhz at the moment, how much should i expect to push?

Now for prime95, at my old 4.0ghz @ 1.4000v i failed prime 95 somewhere between the 2 and 8 hour mark and it BSOD.

But i decided to keep the OC and i seen no problems and only performance increases in countless hours of gaming in BFBC2 and the cpu intensive game GTA IV. Is it bad to be running a OC that is unstable in prime95 but not in many hours of gaming?
Edited by 2JZ - 5/18/11 at 10:19am
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post #2 of 8
Let me start from the beginning, your CPU speed depends upon the fsb and cpu multiplier. Since fsb is am3 stock 200, that means you have OCed the cpu by increasing the multiplier to 20.5. It is no wonder that the OC is unstable. For such a high OC (4.1GHz is quite high for 955BE) you have to use a combination of of increased fsb and multiplier to gain stability. First start by increasing the multi to 19 and see if the cpu speed of 3.8GHz is stable or not. Almost all 955BE c3s reach a stable 3.8GHz very easily. Then start increasing the fsb by small amounts and see if the oc is stable.
Since you are not facing stability issues while doing normal stuff, chances are you may never face instability in recent future. Personally I like to know that my cpu can handle any calculation I throw at it. Prime95 stresses the cpu in a fashion which is beyond the scope of common games or common softwares. While forced to work at a higher rate than stock value, cpus tend to miscalculate stuff. Some errors come up very easily while some take time and higher load to surface. That is why longer prime runs are advised. 4-5 hours is quite sufficient. Once you have achieved your dream OC, you should stress test for 12 hours to be 100% certain that it wont fail.
    
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by leopold1985 View Post
Let me start from the beginning, your CPU speed depends upon the fsb and cpu multiplier. Since fsb is am3 stock 200, that means you have OCed the cpu by increasing the multiplier to 20.5. It is no wonder that the OC is unstable. For such a high OC (4.1GHz is quite high for 955BE) you have to use a combination of of increased fsb and multiplier to gain stability. First start by increasing the multi to 19 and see if the cpu speed of 3.8GHz is stable or not. Almost all 955BE c3s reach a stable 3.8GHz very easily. Then start increasing the fsb by small amounts and see if the oc is stable.
Since you are not facing stability issues while doing normal stuff, chances are you may never face instability in recent future. Personally I like to know that my cpu can handle any calculation I throw at it. Prime95 stresses the cpu in a fashion which is beyond the scope of common games or common softwares. While forced to work at a higher rate than stock value, cpus tend to miscalculate stuff. Some errors come up very easily while some take time and higher load to surface. That is why longer prime runs are advised. 4-5 hours is quite sufficient. Once you have achieved your dream OC, you should stress test for 12 hours to be 100% certain that it wont fail.
great i will start with that then! To check for stability should i run prime95 or just see if it boots properly?
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post #4 of 8
Keep the HT link @ ~2ghz. you will not get any performance increase and can cause instability. Only thing left now for you to do is tighten up your ram timings and OC the crap out of that 460
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by Phobos223 View Post
Keep the HT link @ ~2ghz. you will not get any performance increase and can cause instability. Only thing left now for you to do is tighten up your ram timings and OC the crap out of that 460
roger that, i already got my 460 to 911core, and 1050mhz memory. I play Metro 2033 at full settings with DOF off at a low of 20fps and i hit upwards of 40fps in the easy part. Light is the only thing that kills my gpu.

Crysis Warhead i completed on enthusiast setting for graphics and x4 AA @ 35fps. Im really proud of the performance from a $125 gpu.

I wanted to OC my ram timings, should i downclock the speed to 1333mhz and do that or keep the 1600mhz? Im running cl9 running now, would i need to up the voltage too?
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post #6 of 8
There is a big debate on timings vs speed when it comes to RAM... best thing to do is try both ways and see what works best for your games.

I mean, who cares what benchmarks say, use what works best/smoothest for what you play!
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post #7 of 8
A few things I forgot to mention in last post:

1> CPU speed = FSB x CPU multiplier
2> No significant performance gain in increasing HTlink (as phobos has mentioned)
3> In an AM3 system it is much better if you keep the memory speed at 1600MHz and try to lower the latency values by a lil amount. If you can reach a stable 8-8-8-1T then its pretty good. 7-8-7-2T would be awesome. I havent used hyperX ram so not really sure how low the latency values will reach. Prime95 blend test will test both cpu stability and memory stability for you.
    
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post #8 of 8
Timings > Speed for AMD.

Try to get a bit of the two, unless you are FSB OC'ing like me. I decided ti tight em down like a lil girl!
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