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P7P55D-E Pro will not recognize 1600 MHz

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October 1, 2010 11:35:41 PM

This is probably a very easily solvable issue, but my mobo will allow me to set my RAM to 1600 MHz frequency. I have 2x2GB of G.Skill Ripjaws at 1600MHz, but the mobo has them maxed out at 1333 MHz (can decrease but not increase).

I have been experiencing some stuttering in video games after recently piecing together this build (my first). And as I said, hopefully this can be easily fixed. I have updated (last I checked) to the latest BIOS for my P7P55D-E Pro. What else do you guys need to know, and what else do I need to do?

More about : p7p55d pro recognize 1600 mhz

a b Ĉ ASUS
a c 236 V Motherboard
October 2, 2010 12:03:33 AM

Can you provide the rest of your build? It might not be memory related but another area of the system causing the Lag.
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October 2, 2010 12:37:36 AM

i5 750 (not OCed yet)
Samsung Spinpoint 1TB 7200 RPM (my second guess for stuttering)
Palit OCed GTX 460 1GB
P7P55D-E Pro and G.Skill 2x2GB at 1600 MHz of course
Windows 7 Pro 64 bit

Playing STALKER:SoC btw at max settings (modded with STALKER Complete Pack at v 1.0005)

I am concerned about the stuttering of course, but I'd really like to fix this RAM/Mobo issue first, just so I can verify that this in fact is not what's causing the stuttering.
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October 2, 2010 4:16:02 PM

Okay, so I really can't move on without an answer here. Can somebody at least tell me I'm a noob and I need to do one simple step to get the 1600 MHz to show up?
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a c 207 Ĉ ASUS
a c 717 V Motherboard
October 2, 2010 4:28:52 PM

Simple - change in the "AI Tweaker" | D.O.C.P. then set you 1600 MHz. Changes: 1. AI Overclock Tuner {Auto} -> {D.O.C.P.}, 2. DRAM O.C. Profile -> {DDR3-1600 MHz}, 2. Save & Exit.

Good Luck!
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October 2, 2010 9:25:50 PM

Great! I found this a little while ago, but this is great confirmation. My next question would be, is this even my problem?

How typical is it for RAM to be holding a PC back in a video game? And will frequency fix it, or should I edit the latency?
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a b Ĉ ASUS
a c 236 V Motherboard
October 2, 2010 9:40:30 PM

Typically, RAM doesn't cause lag in games unless it is defective but that doesn't seem to be your case.

I would more suggest your GPU and resolution (if at 1920x1080 or higher). The GTX 460 is great but can struggle on intense graphics at higher resolution.
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a c 207 Ĉ ASUS
a c 717 V Motherboard
October 2, 2010 9:45:28 PM

Theoretically, everything is a bottleneck to some degree. However, focusing on RAM alone it is a function of both Speed and low CAS latency. Ideally, you do want to manually adjust the CAS and Voltage per spec, unless it is listed as Certified {QVL} listed which if it is then use 'XMP' which will exactly set CAS + Voltage per spec; if it is not list then you'll get Post Failure/BSOD/Unstable system.

Improper CAS and Voltage can cost you 2-5+ FPS. By Default the BIOS uses safe a/k/a slow numbers.
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October 2, 2010 9:55:49 PM

So XMP will automatically keep my RAM specs balanced? That sounds like the way to go then.

I saw it in my BIOS but haven't touched it yet.
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a c 207 Ĉ ASUS
a c 717 V Motherboard
October 2, 2010 10:07:26 PM

Yes, but as I stated "Certified {QVL} listed which if it is then use 'XMP' which will exactly set CAS + Voltage per spec; if it is not list then you'll get Post Failure/BSOD/Unstable system.
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October 2, 2010 11:54:25 PM

tecmo34 said:
Typically, RAM doesn't cause lag in games unless it is defective but that doesn't seem to be your case.

I would more suggest your GPU and resolution (if at 1920x1080 or higher). The GTX 460 is great but can struggle on intense graphics at higher resolution.


Sorry, I actually just saw this reply. This seems to be good advice. I am playing at 1080p, and even though SoC is an older game, it is modded with greater texture detail (among other things) and somewhat poorly optimized. So I really need to just try some other games. HL2 seemed to stutter a little, but certainly not to the degree SoC does. I will try this out after I'm done OCing.

I am about to reach 3.2 GHz (leaving Turbo enabled) on my 750, and then I plan to OC my RAM, and even though I still am slightly unfamiliar with each individual latency number and its function, I'll give it a shot.
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a c 207 Ĉ ASUS
a c 717 V Motherboard
October 3, 2010 12:08:17 AM

Next, D/L and run MSI Afterburner - http://event.msi.com/vga/afterburner/ to OC the GPU.

There's a difference between 'lag' and 'stutter' - the GTX 460 "should" be okay at full HD, but as I mentioned above OC the GPU which will make a improvement. Lower quality.

Gaming: is a combo of GPU, CPU, RAM and HDD/SSD - if your HDD takes its' time delivering the 'map' then you get lag -- also to consider is online playing where there's plenty of 'lag'. The 'stuttering' is when your FPS drops from the GPU and/or CPU. Therefore, optimizing everything is the only way to get the most FPS. RAM, I would not push it past ~1700 MHz - the last thing you want is a BSOD after an hour of game play.

Run Prime95 and Memtest86+ (2 passes) before considering your rig 'stable.'
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October 3, 2010 1:22:50 AM

Then maybe what I'm getting is lag. My FPS is about 80 with VSync on (which might mean SoC's VSync is busted idk), but it never stutters with intense fighting, only when moving through a map (when it loads the textures).

I am running a Palit Platinum OCed GTX 460 at 800/1200 MHz (stock GeForce cards are 675/1350 MHz). I don't plan on OCing the 460 anymore unless you're saying it will solve my stuttering (or lagging) problem.

I am OCing my 750 to 3.2 GHz (with Turbo still enabled) at the moment. This increase has bumped my RAM frequency up to 1604 MHz (it only supports up to 1600 MHz I believe). This increase has also bumped up my DRAM voltage to 1.75V, where I believe the stock was 1.5V. Is this normal? Because if it's not, I need to know how to fix it.

I running stability tests right now at 3.2 GHz w/ Turbo and 1604 MHz CAS9 (1.75V is still bugging me though).
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October 3, 2010 1:54:33 AM

Okay, apparently my CPU is not running with Turbo. So here's another issue...

My mobo allows for SpeedStep in its CPU configurations, allowing the CPU to function at lower multipliers when full potential isn't needed. For some reason, at 3.2 GHz this feature is automatically disabled, and it cannot be changed in the BIOS settings. Turbo mode consequently is disabled, as this option only appears when SpeedStep is enabled.

What gives?
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October 3, 2010 2:41:12 AM

I seem to have found a source of the problem. Still not sure about the solution though.

According to Tom's i5 750 article:

http://www.tomshardware.com/reviews/core-i5-750-efficie...

I should be able to OC my CPU all the way up to 3.2 GHz before Turbo is disabled.

However, after messing around with my BIOS for a while, I have determined that the highest my FSB is able to go before Turbo and SpeedStep as well are disabled is 149 MHz (both are deactivated at 150). In the article above, they are clearly able to go to 160 and the option is enabled.

Is this a motherboard issue? Why can my 750 not reach the same potential that Tom's 750 can?

I also noticed that C1E and C-States are disabled. They are enable-able until the same point the Speedstep and Turbo mode are disabled (150 MHz).

Honestly, I'm only trying to recreate the 3.2 GHz 750 in the Tom's article...
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a c 207 Ĉ ASUS
a c 717 V Motherboard
October 3, 2010 2:53:02 AM

czarmurphy said:
This increase has also bumped up my DRAM voltage to 1.75V, where I believe the stock was 1.5V. Is this normal? Because if it's not, I need to know how to fix it.

I running stability tests right now at 3.2 GHz w/ Turbo and 1604 MHz CAS9 (1.75V is still bugging me though).

The 1604 isn't anything to even thing about for 1 second, but as I said 1700 ~ 1800 MHz+ is getting close to the stable limit. You have the DRAM Voltage as {Auto} and you can kick it down a notch; this is a byproduct of the CPU OC.

czarmurphy said:
Okay, apparently my CPU is not running with Turbo. So here's another issue...

My mobo allows for SpeedStep in its CPU configurations, allowing the CPU to function at lower multipliers when full potential isn't needed. For some reason, at 3.2 GHz this feature is automatically disabled, and it cannot be changed in the BIOS settings. Turbo mode consequently is disabled, as this option only appears when SpeedStep is enabled.

What gives?

If you set the BCLK X {Highest} CPU Multiplier then if you use highest CPU Multiplier then there will be no TB. In addition, any OC above +20% you don't want or need TB, and in extreme OC you may even want to eliminate HT.

It "seems" that you "may" be using an ASUS Utility application for your OC; I recommend that you don't. The goal is to manually set all of the values and use the lowest possible Voltage to keep the system OC stable. Then run Stress tests. For "myself" I try to find the OC I want, say 3.8 GHz then I determine the math needed {2 minutes}. Then I will use the lowest Voltage values DRAM, PCH, etc. {that takes some time/1st time hours} At 3.8 MHz you should need to raise any voltages. Article - http://www.tomshardware.com/reviews/core-i5-750-overclo...

TB simply means CPU Multiplier + 1 sporadically and just "sounds cool" but otherwise it is useless; Intel marketing.
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October 3, 2010 3:02:37 AM

So despite the Efficiency article, you would recommend, say, 3.8 GHz w/ no Turbo (and no SpeedStep?) over 3.2 GHz w/ no Turbo (of course) and also over ~2.9 GHz w/ Turbo and Speedstep? That's what your article seems to indicate.
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a c 207 Ĉ ASUS
a c 717 V Motherboard
October 3, 2010 3:28:59 PM

Those numbers seem to be inline with your CPU, but with any OC I do I use what seems to "fit best" for my personal needs, and most always I use multiple OC Profiles e.g. stock, 4.4 and 4.6 GHz. Most OC under 3.8~4 GHz are not too tasking on the components -> heat. Further, don't be a parrot try a series of numbers e,g, BCLK 155...160...170 and find the numbers that work best for reducing speed and increasing CPU speed. It is a trial by error.

I find little need to TB when the CPU is >3.7~4 GHz, but every CPU/RAM/MOBO has its' own environment.
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October 4, 2010 11:28:12 PM

Okay, now my memory is giving me problems.

CPU is 160 x 21 = ~3.4 GHz
RAM is 1600 MHz 9-9-9-24 with DRAM Voltage set to Auto

My mobo has the voltage running at about 1.8 V. This is not good. What should I force the V down to so that it's not ridiculously high but not underhandling my RAM?
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a c 207 Ĉ ASUS
a c 717 V Motherboard
October 5, 2010 12:00:45 AM

Here's the i7 9XX OC Bible - http://vip.asus.com/forum/view.aspx?id=2008122019104023...

Yeah, don't use AUTO, manually set down until stable; I "find" the lowest stable Voltage then add 1-2 notches.

Have fun, BTW the UD3R responds better to higher BCLK and lower CPU multipliers.

Have fun with that link!
;) 
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October 5, 2010 12:24:12 AM

I actually have an i5 750 and an Asus P7P55D-E Pro lol, but I'm taking it with a grain of salt.
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October 5, 2010 12:38:34 AM

Gotcha, it's cool.

I have VRAM forced to 1.6V at the moment, so I will probably lower the timings a little and leave it at that.

The only other question I have is where can I edit my FSB : DRAM ratio? CPU-Z reports that it is 2:10 right now. Apparently the closer it is to 1:1, the better performance you get. Where can I find this ratio? Is this even true?
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a c 207 Ĉ ASUS
a c 717 V Motherboard
October 5, 2010 12:58:59 AM

BCLK x CPU ratio = CPU frequency
BCLK x QPI ratio = QPI link speed {set the ratio to the lowest possible value}
BCLK x Memory ratio = Memory frequency
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October 5, 2010 1:18:05 AM

My problem is I cannot seem to find two of the ratios in my BIOS. I can find BCLK of course, and CPU ratio is no problem either. I can also directly adjust QPI link speed and DRAM frequency, but QPI ratio and Mem ratio are nowhere to be found.

What I'm asking is, am I just doing the math myself? E.g. BCLK / Mem Freq = Mem Ratio
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October 5, 2010 2:18:20 AM

Okay, I did some benchmarks with SiSandra before and after tightening my FSB : DRAM ratio.

Original Ratio -> 2:10 (FSB 160, RAM Freq 800 MHz CAS 8)

Drystone: 91 Whetstone: 39
Int Mem: 19.7 Float Mem: 19.7
Latency: 62 Speed Factor: 52.3

Tightened Ratio -> 2:6 (FSB 200, RAM Freq 600 MHz CAS 7)

Drystone: 92 Whetstone: 40
Int Mem: 16 Float Mem: 16
Latency: 63 Speed Factor: 53.7


So, either I'm doing something wrong, or this ratio thing is not working for me. Even after lowering my timings, latency is actually worsened, with of course the expected drop in bandwidth. I'm going to back to my previous settings.
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Anonymous
a b V Motherboard
May 13, 2012 4:36:05 PM

My settings:

CPU: Intel Core i5-760 @ 2.80 ~ 3.33Ghz (3.33Ghz with Turbo on)
RAM: 16GB Corsair Vengeance 1.5v, 1600mhz, (8-8-8-24-2N....)
GPU: Not important :p 
MOBO: Asus P7P55D-PRO
---

Go into AI Tweaker and change:

1. AI Overclock Tuner = [X.M.P]
2. eXtreme Memory Profile = [Profile #1]
3. CPU ratio setting = [21.0] (This gives me approx. 3.36Ghz which is a gentle OC just to make the RAM run at 1600mhz)
4. Intel(R) SpeedStep(TM) Tech = [Disabled]
5. Xtreme Phase Full Power Mode = [Auto]
6. BCLK Freq. = [160] (160*21=3.36Ghz)
7. DRAM Freq. = [DDR3-1600Mhz]
8. QPI Freq. = [Auto]
9. Asus/3rd party UI... = [Asus...]

10. OC Tuner = [Good Performance] (I don't know what this does, I think it's for a 3rd party program!?)
---

Then we have Voltage which I had to change some :) 

1. CPU Voltage Mode = Manual
---Fixed Voltage = [1.12500] (Which gives me 1.2v in HW monitor and it drops to 1.0v when in load)
2. IMC Voltage = [1.11250] (Said 1.350v before I changed it with that yellow color, I thought hell no! and lowered it ^^)
3. DRAM Voltage = [1.5000] (Same as on my Sticks! Bios gave it 1.543v before)
4. CPU PLL Voltage = [Auto] / [1.800] I think it's said it should be max 0.5v over DRAM voltage... correct me on that one!)
5. PCH Voltage = [Auto] / [1.050]
---

Well I could up the CPUv to 1.13125. I was thinking on running the CPU in 200BCLK with x17 multi for 3.4Ghz. And the RAM on x8 Multi so they can be on 1600mhz still :)  Guess I need 1.2250v for the CPU in that case. ^^
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October 17, 2012 9:36:32 AM

Nevermind the 1.2250v there! it was bogus, i run it on 200BCLK on 3.4Ghz with 1.14v stable :p 
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