[A51] 6990M mobile GPU

Malak Leman malakfun at hotmail.fr
Mon Apr 7 00:59:47 CEST 2014

The laptop has no express-card slot, but has eSata + 2 x internal SATA ports + mSATA ... so plenty of SATA here.
However these are not high end dedicated SATA card and I'm not sure of their NCQ support.
What would an ExpressCard-eSATA bring to the table ?

Anyway, shouldn't a couple of 1TB Samsung 840 EVO (low latency) SSD, capable of 100,000 4k random reads, do well enough on integrated SATA ports ? And beyond laptop requirements, could these recent disks possibly ditch an array of two years old SSD ? 

Besides, I still wish someone could share its experience, and proper Kraken results (or shortcomings) with Radon 5xxxM ou 6xxxM laptop GPU, compared to CPU only.

> Date: Sun, 6 Apr 2014 14:30:28 -0700
> From: adi at hexapodia.org
> To: malakfun at hotmail.fr
> CC: a51 at lists.srlabs.de
> Subject: Re: [A51] 6990M mobile GPU
> On Sun, Apr 06, 2014 at 09:35:17PM +0200, Malak Leman wrote:
>> Since a laptop can't get a dedicated SATA card and an array of disks,
>> what kind of performance per burst can be expected with this GPU and 2
>> x 1Tb SSD ?
> You can use an ExpressCard-eSATA card and two (or more) external disks,
> such as http://www.newegg.com/Product/Product.aspx?Item=N82E16839158039
> You should be able to do about 400 MB/sec through that card, limited by
> the PCIe 2.0 x1 link from the expresscard to the CPU. With 4kB random
> reads that's about 100,000 IOPS.
> (Caveat, it's not entirely clear which ExpressCard 2.0 devices support
> 5Gbit/s links, some are 2.5 Gbit/S limiting you to 200 MB/sec and 50,000
> IOPS.)
> -andy

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