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How do I read/modify/flash SPD/XMP profiles on DDR4 EEPROM? - Page 3

post #21 of 40
When you understand how a computer uses SPD info you see that XMP is a risky, ill performing hoax.
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post #22 of 40
Thread Starter 
I don't understand what you said. What makes modifying XMP risky? Help me understand.
post #23 of 40
Xmp is a hoax and risky in that it's not "real" and any given xmp profile isn't guaranteed to work. Just settings that the ram could perform at. Up to the memory interface to try to work with those settings. Only a guideline. Jdec profile also stored on eeprom. Overwrite that and there is no base spd to fall back on.
post #24 of 40
Thread Starter 
Right, but, even though I'm overwriting the entire eeprom, if the jedec section is unedited and the xmp section is the only thing modified, wouldn't all of the jedec profiles still work like normal as long as I don't try to load xmp? In other words, won't the important parts of the new rom be identical to the stock rom and still function like normal?

If i do load xmp and it fails...could I not reset my cmos, load the 2133 jdec profile, and then flash the ram's eeprom back to my stock backup? or does editing the xmp also modify other important parts of the rom?
Edited by bardacuda - 4/14/17 at 8:51am
post #25 of 40
You can modify the XMP section without the risk of damage for memory modules. You can add, modify or erase XMP profiles with Thaiphoon Burner easely. So, don't worry.
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post #26 of 40
Thread Starter 
That's what I would figure but everyone else seems to think my ram is going to explode if I touch anything.
post #27 of 40
Quote:
Originally Posted by bardacuda View Post

That's what I would figure but everyone else seems to think my ram is going to explode if I touch anything.

I think what's really important here is that you should research what all of the different timings are, what they do, and what impact they have on performance.

Don't get me wrong, I really like where you are going here, and will be following this thread now. I am also not a memory guru, to be clear.
But I think you need to research as much as you can about the primary, secondary and tertiary timings before attempting to adjust things. You should become a "guru" while doing this. This is all just my opinion of course. But in reading the ryzen owners threads. It's very apparent the people who have not overclocked prior to Intel's "K" series shenanigans. And ones that have not used anything other than Intel period.
Just be prepared for frustration, research and potentially loss of product.
post #28 of 40
Quote:
Originally Posted by DaaQ View Post

I think what's really important here is that you should research what all of the different timings are, what they do, and what impact they have on performance.

Don't get me wrong, I really like where you are going here, and will be following this thread now. I am also not a memory guru, to be clear.
But I think you need to research as much as you can about the primary, secondary and tertiary timings before attempting to adjust things. You should become a "guru" while doing this. This is all just my opinion of course. But in reading the ryzen owners threads. It's very apparent the people who have not overclocked prior to Intel's "K" series shenanigans. And ones that have not used anything other than Intel period.
Just be prepared for frustration, research and potentially loss of product.
Quote:
Originally Posted by Voodoo Jungle View Post

You can modify the XMP section without the risk of damage for memory modules. You can add, modify or erase XMP profiles with Thaiphoon Burner easely. So, don't worry.

Voodoo is not guessing about thaiphoon's ability to work with xmp section of ram safely. The concern was whether it worked ONLY on that section and left base spd common to all ram alone.
Read the simmtester link . if it exclusively modifies profiles then it should work fine.

It's what it can't change that is important for safety, and also what might limit it for repair If you can't change something that's broken in an area you normally would be trying to avoid...

RGB repair may not be in the cards.

Only way to tell, is to try. Or find someone who has. specifically, not anecdotally. (They're cagey. very cagey.. I wonder if the ram vendors have men in black..... )
post #29 of 40
Quote:
Originally Posted by yendor View Post

. I wonder if the ram vendors have men in black..... )
LOL
I've talked to the manufacturer's gurus. They're the ones that the men in black are watching over!
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post #30 of 40
Quote:
Originally Posted by yendor View Post

Voodoo is not guessing about thaiphoon's ability to work with xmp section of ram safely. The concern was whether it worked ONLY on that section and left base spd common to all ram alone.
Read the simmtester link .
The XMP Enhancer (a part of Thaiphoon Burner software) works with XMP section only. This editor does not alter minimum timing delays of the DRAM module. For this purpose there is another editor called Timing Table Editor. CRC1 and CRC2 do not cover the XMP profile section. Therefore, it may be corrupted, erased or written with trash data. This will not affect to the module functionally or system in whole, because XMP is not a JEDEC standard. BIOS reads SPD to know which timings need to be set for the Memory Controller and it can read XMP to know timings which are beyond JEDEC standards.
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