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Should I exchange this RAM?

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October 14, 2010 3:51:06 AM

Hey guys I meant to order a 1600Mhz RAM for my EVGA x58 Classified 3x board but noticed that i accidentally ordered the 2000mhz one. So should i keep the 2000mhz with the timing of 8-9-8-24 or return it for the 1600mhz 7-7-7-20. Links of the RAMS are below

1600mhz: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

2000mhz: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

More about : exchange ram

a b } Memory
October 14, 2010 4:39:01 AM

No, you must not. You've got yourself a better deal - More speed, less price. What's more you can ask?
In fact, the 2000 Mhz is better to work at 1600 Mhz, like Hercules fights against ant. It's even able to go 1600 at tighter timings, maybe at timing 6.
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October 14, 2010 5:02:48 AM

okay I stuck with it and went in BIOS and loaded XMP 1 Profile.
Then when the computer restarts it just hangs nothing on the screen.
I then reset the CMOS and left the default in BIOS and computer loads fine.

In E-Leet, Memory reads the following:

DRAM Frequency 530.6MHz
FSB : DRAM 2:8
CL8
tRCD 8
tRP 8
tRAS 20
tRFC 59
CR 1T

Why does it hang when I load the XMP profile, isn't it suppose to work always?

My Spec are as follows:

Windows 7 Pro
EVGA x58 SLI Classified
i7 920 @ stock
SLI GTX470
1TB Western Digital Black
800D Corsair Case
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a c 347 } Memory
October 14, 2010 5:48:31 AM

I've seen compatibility problems with the 2000 MHz GT, and CMT_ series.

That said, turn-OFF XMP and set the RAM 100% manually.
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a b } Memory
October 14, 2010 6:23:16 AM

^+1.. Turn OFF XMP first.. Try running the memory modules with tighter (more even) timings and at a lowered clock speed..
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October 14, 2010 10:19:39 AM

Yes turn XMP off, also check your motherboard manual where to put the stick on which slots.
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October 14, 2010 2:50:52 PM

Yeah tried the XMP off. and manually set the specs from the memory manufacturer and also raised the CPU VTT Voltage to 1.55v and DIMM Volt to 1.65v

So far I can get it running at 1600mhz with timings of 7-8-7-20 1CT. I might be able to get tighter timings but haven't really messed much. So I cant really get speeds higher than 1600mhz which is the problem.

Should I stick with 1600mhz and then go with tighter timings?

I know that 1600mhz version comes with timings of 7-7-7-20 so with the 2000mhz if i go with 1600mhz I can go much tighter timings than that right?
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a c 347 } Memory
October 14, 2010 4:42:25 PM

One of the 'compatibility' issues included the inability to get 2000 MHz.

That said, and as I've mentioned in other posts, part of the 'fun' is to isolate the RAM from everything else which means leaving the other settings including but not limited to CPU/FSB voltages. If raising the voltage is the only thing keeping the system stable then of course leave it alone.

However, for now, and raise both the DRAM and VTT voltage 1-2 notches.

edit: Also, that RAM is meant to run best when the BCKL is >160~200.
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October 14, 2010 5:01:11 PM

I have a EVGA board and I couldn't find QPI/VTT Voltage so I looked it up and found that on EVGA boards it is named as CPU VTT Voltage. That is correct?

I'm sorry I am not very familiar with overclocking hence the reason I bought a XMS profiled RAM but guess that wont work either.

Is there someone that can walk me through what to set each settings at?

I have EVGA X58 SLI Classified, i7 920, Windows 7 Pro 64bit, 6GB (3x2GB) Corsair Dominator CMT6GX3M3A2000C8.

Thank you,


I am also gonna give Corsair a call.
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a c 347 } Memory
October 14, 2010 5:07:14 PM

QPI = VTT; jumping post to post - my error, corrected above.
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October 14, 2010 5:28:55 PM

jaquith said:
QPI = VTT; jumping post to post - my error, corrected above.



thats no problem, I just appreciate you giving me responses and quick ones too.

I currently have DIMM Voltage on 1.65v and CPU VTT Voltage @ 1.55v

so you want me to bring it above those by 1-2 notches?
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a b } Memory
October 15, 2010 3:04:43 AM

Don't. The max safe setting for DDR3 is 1.65V. Pushing further than that, it's past safe zone. Well, maybe you need an aftermarket RAM cooler but I can't assure you as I haven't tried it myself. As for the CPU voltage, I don't quite know.

tenzin said:
Yeah tried the XMP off. and manually set the specs from the memory manufacturer and also raised the CPU VTT Voltage to 1.55v and DIMM Volt to 1.65v

So far I can get it running at 1600mhz with timings of 7-8-7-20 1CT. I might be able to get tighter timings but haven't really messed much. So I cant really get speeds higher than 1600mhz which is the problem.

Should I stick with 1600mhz and then go with tighter timings?

I know that 1600mhz version comes with timings of 7-7-7-20 so with the 2000mhz if i go with 1600mhz I can go much tighter timings than that right?



Well, the 1600 Mhz with low timings probably could be upped to 2000 Mhz with loose timings, so say, 2000 Mhz 9-9-9-24.

So it's rather equal strength. Maybe your 2000 Mhz can be set to 1600 possibly lower timings than 1600 7-7-7-20, maybe 7-6-7-20 or maybe even 6-7-6-18 (can try at upped voltage 1.65v or even possibly lower). The advantage of 2000 Mhz sticks is they're tested to run 2000 Mhz. So if you can't run it @2000 (other than mobo memory support or memory speed limitations or other part limitations) you can RMA them. While the 1600 one is only tested at 1600 Mhz tight timings, and no claim when you cannot get 2000 speed.
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October 15, 2010 4:44:01 AM

Thanks for the responses.

I tested each memory module individually with XMP profile and all of them hangs the system so it cant be a bad stick. I called corsair and the tech said that achieving a 2000mhz is difficult for my i7 920 CPU and that since i am able to achieve 1600mhz thats where it should be. So most likely it is because of my memory controller. I tried the CPU VTT Voltage (aka OPI/VTT Voltage) to 1.54v and dont want to push any above that.

So far I got my memory on 1600mhz with timings @ CL7-8-7-20 Command Rate @ 2T. I will just run some memtest and see if its stable. If it is then I will lower the timings and run more tests.

Thanks everybody.
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a c 347 } Memory
October 15, 2010 1:58:46 PM

Sorry, yesterday I had a horrible headache, and left work to sleep 18 hours - it was that bad.

As I first, indicated "One of the 'compatibility' issues included the inability to get 2000 MHz."

By the time you open the package it was too late,my suggestion was going to recommend that you exchange for Corsair Dominator's. http://www.tomshardware.com/forum/281476-30-help-choosi...

CORSAIR DOMINATOR 6GB (3 x 2GB) DDR3 1600 (PC3 12800) Triple Channel Kit Model TR3X6G1600C8 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Good Luck!
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