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[Official] Gigabyte GA-990FXA-Series Owners Thread/Club - Page 321

post #3201 of 12377
Well, that didn't work, I still can't achive the same OC as before now. Since that "VRM MOS protection" I have to increase my CPU voltage from 1.375v to 1.400v to achive 3.8GHZ, which is the "Sweet spot" so to speak, if you can do it at 1.375v, that is.
¿Anyone knows of a way to force the MoBo to restore the back up bios settings? Thanks in advance.
post #3202 of 12377
Quote:
Originally Posted by vonss View Post

Well, that didn't work, I still can't achive the same OC as before now. Since that "VRM MOS protection" I have to increase my CPU voltage from 1.375v to 1.400v to achive 3.8GHZ, which is the "Sweet spot" so to speak, if you can do it at 1.375v, that is.
¿Anyone knows of a way to force the MoBo to restore the back up bios settings? Thanks in advance.

The old Gigabyte boards used to allow you to manage the back up BIOS but I think they "idiot proofed" it now and made the update automatic.

In other words, once you successfully boot, you're stuck with what you just flashed. Always a good idea to save your BIOS before flashing a new one.

WW
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post #3203 of 12377
So I'm screw in other words.
¿But why if i restore an older BIOS, the one I was usin' does not fix it? It Befuddles me!
post #3204 of 12377
Quote:
Originally Posted by vonss View Post

So I'm screw in other words.
¿But why if i restore an older BIOS, the one I was usin' does not fix it? It Befuddles me!

I think the key is once you successfully boot or perhaps even just POST the back up BIOS is copied over with the current one. The way I read the description the back up BIOS only kicks in if you fail to POST or your primary BIOS becomes corrupted. This is a significant departure from the way it used to be.

WW
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post #3205 of 12377
On my one I can get into backup bios by.
Hold down power button, Turn PSU switch off on while still holding power button then let power button go.
Will boot with bios with all safe settings, But the bios will be the same version as what the primary one is just with safe settings instead of defualt/overclocked settings.
post #3206 of 12377
Quote:
Originally Posted by Wild Wally View Post

This is a significant departure from the way it used to be.WW

I couldn't agree more with that.
I guess I'll have to wait till the a new BIOS update or just suck it up.
I still can't emphasize enough how is it possible that using older BIOS does not fix this.
¿No one else had this problem?
I don't think it could be any other thing since everything else works as intended. This is far stretched, but the only other thing I did it was do some changes with TouchBios, but I hardly see how that affect it.
post #3207 of 12377
Quote:
Originally Posted by bmgjet View Post

On my one I can get into backup bios by.
Hold down power button, Turn PSU switch off on while still holding power button then let power button go.
Will boot with bios with all safe settings, But the bios will be the same version as what the primary one is just with safe settings instead of defualt/overclocked settings.

Yeah I know, that's the whole problem. I messed up and Gigabyte making this dual BIOS for "dummies" certainly didn't worked in my favor xD
post #3208 of 12377
I just bought a ga-990fxa-ud3 this week along with a phenom II 965 and 8GB (2x4gb) DDR3 2000 (PC3 16000) Mushkin Blackline RAM and my memory clock in the bios only goes up to 8x so i can only get a RAM clock of 1600. I've seen people be able to use a 9.33x memory clock and i was wondering how/if I can do this or else i have to change my CPU Frequency to 250 to obtain a 2000MHz clock speed. If i can't get it to 2000 ill be happy with 1600 since i got it on sale at the same price as mushkin redline 1600 ram and can run the same timings with a lower voltage and still be stable.
post #3209 of 12377
Quote:
Originally Posted by Stealthy Wombat View Post

I just bought a ga-990fxa-ud3 this week along with a phenom II 965 and 8GB (2x4gb) DDR3 2000 (PC3 16000) Mushkin Blackline RAM and my memory clock in the bios only goes up to 8x so i can only get a RAM clock of 1600. I've seen people be able to use a 9.33x memory clock and i was wondering how/if I can do this or else i have to change my CPU Frequency to 250 to obtain a 2000MHz clock speed. If i can't get it to 2000 ill be happy with 1600 since i got it on sale at the same price as mushkin redline 1600 ram and can run the same timings with a lower voltage and still be stable.

My friend ! Memory frequency over 1333MHZ will not give any performance increase unless you don't increase CPU-NB frequency as well(Integrated Memory Controller's speed). Memory speed depends on IMC/CPU-NB speed. You can assume CPU-NB speed is a path for memory speed on which memory can run. Memory bandwidth can never be equal to or greater than IMC bandwidth. According to CPU architecture Memory always runs at lower speed that IMC/CPU-NB speed. I want you to understand following calculations to be cleared.

Default IMC/CPU-NB speed is 2000MHz.
This means theoretically IMC bandwidth will be (2000 x 32) / 8 = 8000 MB/s for single channel
and for Dual Channel operation it will be 8000 x 2 = 16000 MB/s or 15.6GB/s

Now if our DRAM runs at 1333MHz dual channel,
the memory bandwidth will be (1333 x 64) / 8 = 10664 x 2 = 21328 MB/s or you can say memory bandwidth will be 20.8GB/s

This result tells us that even at default clocks memory speed is higher than CPU-NB speed. And I've stated already that DRAM speed can never be equal to or greater than CPU-NB/IMC speed.
This proves even 1333MHz is easily bottlenecked by CPU-NB running at 2000MHz, and according to the theory original memory bandwidth will be less than 15.6GB/s


Now consider you want to run your memory/DRAM at 2000MHz. Theoretically Memory bandwidth should be (2000 x 64) / 8 = 16000 x 2 = 32000 MB/s = 31.25GB/s
But this bandwidth will be bottlenecked to <15.6GB/s because obviously integrated memory controller speed is not more than 15.6GB/s because CPU-NB is runni9ng at 2000MHz.


Lets say, To get optimum performance of 2000MHz DRAM, you will have to run IMC/CPU-NB at more than or equal to 4000MHz (you can calculate by yourself) which I believe that is not possible for any currently available AMD CPU at least. However you can get most of total memory bandwidth efficiency by increasing CPU-NB to 2800-3000MHz at least.

To get the best memory performance and more than significant performance increase, I suggest you to run DRAM frequency between 1500-1700MHz with tightest timing (CL5, CL6 or CL7) with increased CPU-NB at 2500-3000MHz. This is only what you can do the best for your Deneb CPU.
Edited by sumitlian - 6/4/12 at 2:29am
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post #3210 of 12377
Quote:
Originally Posted by sumitlian View Post

My friend ! Memory frequency over 1333MHZ will not give any performance increase unless you don't increase CPU-NB frequency as well(Integrated Memory Controller's speed). Memory speed depends on IMC/CPU-NB speed. You can assume CPU-NB speed is a path for memory speed on which memory can run. Memory bandwidth can never be equal to or greater than IMC bandwidth. According to CPU architecture Memory always runs at lower speed that IMC/CPU-NB speed. I want you to understand following calculations to be cleared.
Default IMC/CPU-NB speed is 2000MHz.
This means theoretically IMC bandwidth will be (2000 x 32) / 8 = 8000 MB/s for single channel
and for Dual Channel operation it will be 8000 x 2 = 16000 MB/s or 15.6GB/s
Now if our DRAM runs at 1333MHz dual channel,
the memory bandwidth will be (1333 x 64) / 8 = 10664 x 2 = 21328 MB/s or you can say memory bandwidth will be 20.8GB/s
This result tells us that even at default clocks memory speed is higher than CPU-NB speed. And I've stated already that DRAM speed can never be equal to or greater than CPU-NB/IMC speed.
This proves even 1333MHz is easily bottlenecked by CPU-NB running at 2000MHz, and according to the theory original memory bandwidth will be less than 15.6GB/s

Now consider you want to run your memory/DRAM at 2000MHz. Theoretically Memory bandwidth should be (2000 x 64) / 8 = 16000 x 2 = 32000 MB/s = 31.25GB/s
But this bandwidth will be bottlenecked to <15.6GB/s because obviously integrated memory controller speed is not more than 15.6GB/s because CPU-NB is runni9ng at 2000MHz.

Lets say, To get optimum performance of 2000MHz DRAM, you will have to run IMC/CPU-NB at more than or equal to 4000MHz (you can calculate by yourself) which I believe that is not possible for any currently available AMD CPU at least. However you can get most of total memory bandwidth efficiency by increasing CPU-NB to 2800-3000MHz at least.
To get the best memory performance and more than significant performance increase, I suggest you to run DRAM frequency between 1500-1700MHz with tightest timing (CL5, CL6 or CL7) with increased CPU-NB at 2500-3000MHz. This is only what you can do the best for your Deneb CPU.

right...
Your deneb cpu does not support higher than 1600MHz memory, it can be done with a bulldozer, which will go up to 1866.
and the whole story above is nice to know, but unimportand because stock cpu-nb speed is 2200MHz, which is enough for 1866MHz memory. if you go over those specs, you're overclocking and thats not as simpel as changing your bios to the factory settings. and the sweet spot of the CPU-NB for best performance with good stability, is about 2400 to 2600 MHz.
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