• Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
    Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.

PCIe lanes discrepancy?

E

ekological

n00b
Joined
Sep 7, 2009
Messages
40
Hi guys,

I have an old Supermicro X9SRi-F where the documentation says there is one PCIe 3.0 x16, one 3.0 x8 and one 2.0 x4. I recently bought a Samsung 950 Pro M.2 and bought the Lycom DT-120 and installed it into the 3.0 x8 slot. To my surprise, CrystalMark was showing 1660MB/s vs the more typical 2200+ I see posted everywhere else. What gives?

Then I started going down the path of "maybe it's time to overhaul"... I recently purchased an eVGA GTX980Ti with the copper block since that was the only way I was going to use the video card, M.2 card in a PCIe card and a PCIe sound card (the motherboard doesn't have onboard sound). Video card is necessary to drive the Dell UP2715K.

I've been eyeing the LGA 2011 v3 chips as they are unlocked. Any motherboard recommendations if I decide to upgrade? I'd like to stick with motherboards capable of using registered memory. My main use is code development, large multi-GB stitched panos, and hopefully video editing.

TIA,
Chester
 
Hmmm...didn't think of that, but I did pull the sound card and tried again. Same result. The CPU is an E5-1650v2. I even upgraded the BIOS to the latest version.

162379328.Vcv46cYu.samsung950.jpg
 
Well, aside from pulling the GPU and testing in the primary x 16 with nothing else. I can't think of anything holding you back but the board (or adapter)..?

You might be hitting a shared bus where you are losing some speed..? Not sure, but even so, 1600+ is still very respectable :)

I DO know people hit thermal throttles with these, keep that in mind.
 
Yeah, pulling the video card or swapping positions was next on my list. I also thought that 1660 was nothing to shake a stick at, but 600MB/sec is what a SSD over a SATA3 port will do too!
 
ekological said:
What would cause there to be a difference between max link speed and current link speed?

162379425.R5zVxutX.hwinfo.jpg
Click to expand...

Number of devices you have plugged into your slots, On my Z9PE-D8 I have 7 PCIe X16 slots, however slots 1 & 3 will auto down grade if anything is plugged into slot 2 or 4 and they are both x8 to begin with according to the block diagram. Slots 5-7 will only work if I install the 2nd cpu and add its 40 PCIe lanes.

The block diagram in your manual should show exactly what is connected to what and at what speed.
 
Also, this is somewhat confusing since if the max bandwidth for x4 is 1.6GB/sec, how is this happening?
 
Shared bus, or your slots are down grading themselves as you insert more cards.
 
You must log in or register to reply here.
Back
Top