topic Re: Bought an i5-2400S without AES-NI, how come?? in Mobile and Desktop Processors

Bought an i5-2400S without AES-NI, how come??

idata — Fri, 08 Apr 2011 11:38:46 GMT

Hi,

I just finished building my home-server and ran several tests including a few processor checks with AIDA64, CPU-Z.

Both show, that AES-NI is not supported on that CPU, but Intel specs say it does.

I am running this on an DQ67SW with 16GB RAM.

Everything else is fine, but I considered encryption on the disks using bitlocker, for which I would definetely not going to without that feature.

Can somebody explain?

Thanks,

Don

Re: Bought an i5-2400S without AES-NI, how come??

Salem_W_Intel1 — Thu, 28 Apr 2011 17:54:03 GMT

Hi,

Processor-wise, I confirm the Intel® Core™ i5-2400S Processor does feature AES-NI; see under the "Advanced Technologies" section here:

http://ark.intel.com/Product.aspx?id=52208&code=i5-2400S http://ark.intel.com/Product.aspx?id=52208&code=i5-2400S

See also on page 11 of the processor datasheet:

http://download.intel.com/design/processor/datashts/324641.pdf http://download.intel.com/design/processor/datashts/324641.pdf

Hence, I'd recommend running our Intel(R) Processor Identification Utility (click http://downloadcenter.intel.com/SearchResult.aspx?lang=eng&ProductFamily=Processors&ProductLine=Processor+Utilities&ProductProduct=Intel%C2%AE+Processor+Identification+Utility here). Once you have it open, under the "CPU Technologies" tab, you should have 'Intel(R) AES New Instructions' displayed with a 'Yes'. That should confirm it, and consequently, I'd recommend contacting the developers of both, AIDA64 and CPU-Z, for them to further-explain on why their software indicate "AES-NI is not supported".

Re: Bought an i5-2400S without AES-NI, how come??

idata — Thu, 28 Apr 2011 18:39:42 GMT

Hey,

thanks for your info.

I've just downloaded that tool, ran it - and it does say AES-NI "NO" - like it does with "Intel Virtualisation Technology" and "Hyperthreading" (that is normal for 2400S indeed).

Any option for processor in (and trust me on this "latest" EFI-BIOS) is turned on. I bought this mainboard and cpu in Germany. Could it be the mainboard not supporting this?

I would be very grateful, if you could tell me detailed info on how to proceed.

Don

Re: Bought an i5-2400S without AES-NI, how come??

idata — Thu, 28 Apr 2011 19:10:02 GMT

New info:

Switching from Windows 2008R2 with Hyper-V role enabled to test-Win7SP1 installation showed that AES-NI is available in this OS.

Why isn't it in kernel-equalling 2008R2 ?

Is it the installed server system or Hyper-V role, that blocks it? I did not know of any these limitations!

Thanks for info,

Don

Re: Bought an i5-2400S without AES-NI, how come??

idata — Fri, 29 Apr 2011 06:00:44 GMT

Just got the info while googling. When activating the hyper-v role, AES-NI becomes unavailable for parents as well as child-partitions by design.

Thanks!