Transcend AxeRam 2000. How do I...?

Push it to the max but make sure that you keep it cool!
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StarBound
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Transcend AxeRam 2000. How do I...?

Post by StarBound »

My system specs are in my signature.

I have no idea how QPI works. I have no idea how overclocking works either.
When I go into my BIOS I enable XMP. My ramspeed goes up to 1998mhz which is just 2 short of 2000mhz but my cpu base clock increases from 133 to 166. The result is my cpu suddenly shows as a 3.5ghz processor.

The ram timing should be 9-9-9-24. After a restart the ram shows a 9-9-9-27 on CPU.

What do I need to do to clock my ram to its 2000mhz setting without overclocking my cpu from 2.8ghz? Or is ram and cpu speeds liked with i7 processors?
Last edited by StarBound on 23 Sep 2010, 10:43, edited 1 time in total.
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Re: Transcend AxeRam 2000. Who do I...?

Post by KillerByte »

The speed of your memory and processor are linked.

They both are multiples of the base clock. The maximum speed your memory will reach at stock CPU speed will be 1600MHz by pushing the multiplier to the max.
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Re: Transcend AxeRam 2000. Who do I...?

Post by StarBound »

Oops made a mistake on the top post. My memory has changed:
Transcend AxeRam DDR3 2000 XMP.
http://www.transcendusa.com/Press/index ... axn=Detail

Is there no way I can keep my i7 at 2.8ghz while pushing the memory up to 2000mhz?
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Re: Transcend AxeRam 2000. Who do I...?

Post by SykomantiS »

If your cpu has an unlocked multi, you could up base clock till the ram runs @ 2GHz, and drop your cpu multi until you reach 2.8GHz
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Re: Transcend AxeRam 2000. Who do I...?

Post by KillerByte »

Using the Intel eXtreme Memory Profiles (XMP) is the best way to get your memory at its rated speed without the need to get your hands dirty overclocking. The system will over clock your CPU by just a bit and this will be well within the safety limits of your processor. Turbo mode will more than liekely push your processor further than the XMP.
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Re: Transcend AxeRam 2000. Who do I...?

Post by StarBound »

So I can just enable it and let it sort out the rest? No fiddling with voltage or other settings?
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Re: Transcend AxeRam 2000. Who do I...?

Post by KillerByte »

100% correct
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Re: Transcend AxeRam 2000. Who do I...?

Post by StarBound »

Ok I dug up this on the tomshardware forums.
http://www.tomshardware.co.uk/forum/271 ... m-enabling
ekoostik wrote:And here's my long answer:

Turning on XMP (and not making any other changes) will usually disable EIST, C-states and Turbo because your motherboard considers this an OC. That's my experience with Gigabye, and I've had some confrimation on other boards.

With an i5 750 you cannot run RAM any faster than 1333 with effectively OCing your computer or making trade-offs. You can often turn on XMP in BIOS, but this changes your BCLK which also affects your CPU speed. As I mentioned, as a side effect it will likely end up turning off functionality such as Turbo, EIST, sleep states. You can usually turn most of those back on but you have to specifically do it. But Turbo will be lost unless you OC your CPU.

To provide a little more detail on why XMP affects your CPU, we need to discuss how the RAM and CPU speeds are determined. There are 3 important settings: BCLK, Memory Multiplier, and the CPU Clock Ratio.

RAM Speed = BCLK x Memory Multiplier
CPU Speed = BCLK x CPU Clock Ratio

By default, the 1156 socket chips run with a BCLK of 133. The CPU and RAM attain different speeds by using different multipliers.

The Max Memory Multiplier that is available to the i5 750 chip is one that allows RAM to reach a speed of 1333 MHz at default BCLK. Doing the math, this is basically 10 (some boards treat it differently, but fundamentally it can be thought of as 10) because 133 BCLK x 10 Memory Multiplier = 1333 MHz.

The Max Memory Multiplier that is available to the i7 8xx chips is one that allows RAM to reach a speed of 1600 MHz at default BCLK. Doing the math, this is essentially 12 because 133 BCLK x 12 Memory Multiplier = 1600 MHz.

The i5 750 runs with a default CPU Clock Ratio of 20. This gives it it's default CPU speed of 133 BCLK x 20 CPU Clock Ratio = 2.66 GHz. When XMP is turned on for 1600 MHz RAM, the BCLK is usually changed to 160**. Remember, the max memory multiplier available to the i5 750 is 10, so to hit 1600 MHz the motherboard must change the BCLK to: 1600 / 10 = 160.

(The i7 860 runs with a default CPU Clock Ratio of 21. This gives it it's default CPU speed of 133 BCLK x 21 CPU Clock Ratio = 2.80 GHz.)

As a result of this BCLK change, the CPU speed changes. If the CPU Clock Ratio did not change your CPU would be OCed to 20 x 160 = 3.2 GHz. Most (if not all) motherboards would deem this too dangerous to allow when a user only flips the XMP profile. So, the boards drop the CPU Clock Ratio in response to the raised BCLK. Based on what I've seen around the forum, most boards will drop the CPU Clock Ratio to 17. This means your CPU is running at a speed of 17 * 160 = 2.72 GHz.

I don't know how Asus or others handle this, but Gigabyte treats this change as an OC. If you have left other settings as is, they will disable Turbo, EIST, and Sleep States. These functions can be turned back on, but you have to go in and flip the settings from "Auto" to "Enabled". "Auto" means the motherboard decides whether or not to allow these functions. By setting it to "enabled" you ensure that they are always available. And for Turbo you'll have to change your CPU multiplier back to its default setting (20 for i5 750, 21 for i7 860).

Of course once you have XMP turned on and your BLCK gets bumped up to 160, if you enable Turbo it will run your machine even faster. When Turbo kicks in, the CPU Clock Ratio changes. For example, with one core of an i5 750 active Turbo might raise the CPU Clock Ratio as high 24. This gives a stock CPU a max speed of 133 BCLK x 24 CPU Clock Ratio = 3.20 GHz. But with XMP on and a BCLK of 160, your new max speed is 160 x 24 = 3.84 GHz. You'll want to test your system for stability running at these settings. Keep an eye on V and heat.


Putting this all together, at default/stock for an i5 750 we have:
BCLK = 133
Memory Multiplier (effectively) = 10
CPU Clock Ratio = 20

RAM Speed = BCLK x Memory Multiplier = 133 x 10 = 1333 MHz
CPU Speed = BCLK x CPU Clock Ratio = 133 x 20 = 2.66 GHz

When Turbo kicks in (for example, let's say it is at it's max):
BCLK = 133
Memory Multiplier (effectively) = 10
CPU Clock Ratio = 24

RAM Speed = BCLK x Memory Multiplier = 133 x 10 = 1333 MHz
CPU Speed = BCLK x CPU Clock Ratio = 133 x 24 = 3.20 GHz


With 1600 RAM and XMP on**:
BCLK = 160
Memory Multiplier (effectively) = 10
CPU Clock Ratio = 17

RAM Speed = BCLK x Memory Multiplier = 160 x 10 = 1600 MHz
CPU Speed = BCLK x CPU Clock Ratio = 160 x 17 = 2.72 GHz

Turbo will only work if the CPU Clock Ratio is set to 20. So if you turn on XMP, and you enable Turbo and change the CPU Clock Ratio:
With 1600 RAM and XMP on, when Turbo kicks in (for example, let's say it is at it's max):
BCLK = 160
Memory Multiplier (effectively) = 10
CPU Clock Ratio = 24

RAM Speed = BCLK x Memory Multiplier = 160 x 10 = 1600 MHz
CPU Speed = BCLK x CPU Clock Ratio = 160 x 24 = 3.84 GHz

**It's possible when you turn XMP on some boards may not change the BCLK to 160 and the CPU multiplier to 17 and Turbo off. But so far that has been my observation. Let me know if you find anything different.
Let me get all old OC stuff out of the way. Back in the 90s/00s if you changed clock speed eg 66x7.5 = 500mhz and 100x5 = 500mhz it WASNT the same and pcs tend to give issues. Are CPUs today less fussy about how they get the right clock speed?
eg 860 @ 2.8ghz = 133x21 vs 860 @ 2.8ghz = 200x14?
Can I up my BCLK (assuming it stands for base clock) to 200 and let it handle the rest? With system ram set to 2000mhz (200x10)?
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Re: Transcend AxeRam 2000. Who do I...?

Post by KillerByte »

systems today are just as funny about the clock speed and multiplier combo.
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Re: Transcend AxeRam 2000. Who do I...?

Post by StarBound »

So if I am to try the 200mhz it will be a hit and miss trial?
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Re: Transcend AxeRam 2000. Who do I...?

Post by KillerByte »

honestly, if you want to keep things simple just enable the XMP, sit back and relax. but if you want to keep Turbo enabled then you will need try your hand at overclocking
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Re: Transcend AxeRam 2000. Who do I...?

Post by StarBound »

The board keeps turbo boost enabled. Loaded up Cpu-Z just as windows still started. It clocked my pc at 29x166.6 (4.8ghz) but its down to 9x166 now.

I dont have the money to waste on a spec like this. But obviously I want it to run as intended.
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Re: Transcend AxeRam 2000. Who do I...?

Post by StarBound »

My system crashes a while after using XMP.
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Re: Transcend AxeRam 2000. Who do I...?

Post by KillerByte »

what is the voltage for those sticks? 1.6v?

Make sure that the DDR voltage is set to 1.6 or just above it but nothing more than 1.65v
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Re: Transcend AxeRam 2000. How do I...?

Post by StarBound »

They are suppose to be 1.6V. I don't know how to check voltages and stuff. ATM I am just happy that my system is stable with those RAM chips since the corsair kept giving issues (and has been identified as faulty by my supplier).
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