AMD Kaveri: Open-Source Radeon Gallium3D vs. Catalyst 14.12 Omega Driver

[dungeon]

Hmm, funny thing, on my A10-7850K it shows the speed as 1333Mhz while BIOS and dmidecode say it's 2133Mhz (RAM is capable of 2400Mhz and works fine with just 2 DIMMS, but it's not stable with 4 DIMMS)

That is actually quite correct it does not read current actual speed but reads first JEDEC part SPD info from dimms, i guess CPU-Z on Windows will show you the same

http://www.tomshardware.co.uk/forum/id-1910340/rams-working-full-potential.html

What happens for you when you first time plug that memory module on new board

For my module it say 11-11-11-28, and that is what it i get by default, but it is tested and advertised as 9-9-9-27 that means you can safely run ont those:

http://www.kingston.com/datasheets/KHX1600C9D3_4G.pdf

Yup readings from SPD is quite correct

[dungeon]

As explained in my earlier post, I've found the Linux RAM utilities be rather unreliable besides the other shortcomings.

You can combine two infos ... and yeah Windows utilities are also "unreliable"

http://www.gskill.us/forum/showthread.php?t=10565

[Nobu]

Yeah, dmidecode only gets the spd values, not the xmp profiles on the ram (nevermind the actual setting, if you changed it--reduced timings for an overclock, for instance).

My RAM's spd profile defines DDR3-1600 ram with some standard timings at 1.5v, while the two XMP profiles define 2400 and 2666 ram with much tighter timings at 1.65v. My current configuration reflects none of those:
BCLK 136
* 36 ~= 4.898Ghz (CPU),
* 16 ~= 2177Mhz (RAM) at CAS 9-10-10-34; 4-4-6-300, tRTP-tRRD-tWTR-tRFC.

My ram's pushing about 1/3rd my L2 cache's bandwidth at 1.64v (with a few errors on block-move in memtest86, almost same spot every time--450-to-550MB. Probably a hardware issue, since I also rarely get an error in test 7 in the same region...forget which that is. Also happens at stock clocks/timings)...but I can't read the speeds on Linux. D:

[dungeon]

but I can't read the speeds on Linux. D:

Thing is no OS can read what BIOS fancy guis can provide if they do

Hey, even Google Search with the same browser version search differently on Windows and Linux

[Ansla]

That is actually quite correct it does not read current actual speed but reads first JEDEC part SPD info from dimms, i guess CPU-Z on Windows will show you the same

http://www.tomshardware.co.uk/forum/id-1910340/rams-working-full-potential.html

What happens for you when you first time plug that memory module on new board

For my module it say 11-11-11-28, and that is what it i get by default, but it is tested and advertised as 9-9-9-27 that means you can safely run ont those:

http://www.kingston.com/datasheets/KHX1600C9D3_4G.pdf

Yup readings from SPD is quite correct

Yes, you are right, when I first assembled my desktop the default speed for the RAM was set to 1333Mhz, that is what the DIMMs are advertising unless you use XMP profiles or manual settings. But that also makes it worthless at determining the actual speed of the DIMMs in use.

Yeah, dmidecode only gets the spd values, not the xmp profiles on the ram (nevermind the actual setting, if you changed it--reduced timings for an overclock, for instance).

No, dmidecode does read the actual speed in use (but only runs as root), it's decode-dimms (that also runs as a regular user) that reads the advertised speed which is worthless for DIMMs with XMP profiles.

[dungeon]

Yes, you are right, when I first assembled my desktop the default speed for the RAM was set to 1333Mhz, that is what the DIMMs are advertising unless you use XMP profiles or manual settings. But that also makes it worthless at determining the actual speed of the DIMMs in use.

Yes, dmidecode is better for that or what phoronix should use to show memory frequency (latencies really can't differ benchmarks so much)... decode-dimms is only my answer how to show additional info about dimms, because dmidecode does not provide that info.

[Michael]

Yes, dmidecode is better for that or what phoronix should use to show memory frequency (latencies really can't differ benchmarks so much)... decode-dimms is only my answer how to show additional info about dimms, because dmidecode does not provide that info.

PTS does use dmidecode but still it's root-only and I've found systems where it doesn't work / reports inaccurately.

[dungeon]

PTS does use dmidecode but still it's root-only and I've found systems where it doesn't work / reports inaccurately.

Yup it seems so, for some it is doubled but for some it is not as i see for Ansla it shows 2132 MHz, but for me it is 800MHz and this actually running at 1600Mhz ... If i look at just that i can't say it is actually really 800MHz or 1600MHz

Handle 0x002D, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002A
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM_A2
	Bank Locator: CHANNEL A
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 800 MHz
	Manufacturer: Kingston        
	Serial Number: 731CE516
	Asset Tag: A1_AssetTagNum1
	Part Number: KHX1600C9D3/4GX   
	Rank: 1
	Configured Clock Speed: 800 MHz

[dungeon]

Or is just that connected with Ranks maybe For single should be readed as doubled, but for dual it is right It might be that, but dunno for sure

[Nobu]

No, dmidecode does read the actual speed in use (but only runs as root), it's decode-dimms (that also runs as a regular user) that reads the advertised speed which is worthless for DIMMs with XMP profiles.

Ah, sorry, yeah. Mixed them up for some reason...not sure why--don't even have dmidecode installed. Still, (in my case, at least) only shows the speed it would be if my bclk was at 100:

<snip \>
Memory Device
        Array Handle: 0x0023
        Error Information Handle: Not Provided
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 4096 MB
        Form Factor: DIMM
        Set: None
        Locator: Node0_Dimm3
        Bank Locator: Node0_Bank0
        Type: DDR3
        Type Detail: Synchronous Unbuffered (Unregistered)
        Speed: 1600 MHz
        Manufacturer: Kingston          
        Serial Number: 650D110D    
        Asset Tag: Dimm3_AssetTag
        Part Number: KHX2666C11D3/
        Rank: 1
        Configured Clock Speed: 1600 MHz

I could figure that out, but it's non-trivial if you don't know your multiplier or bclk, especially if the bios/firmware lies to you about your processor's speed (which mine does if AMD Cool 'n' Quiet^TM is enabled). Also doesn't tell you voltages, though I understand that can be tricky. Unfortunately, my MB doesn't expose any voltage or temperature sensors, other than the CPU's temp.