gpu x8 not x16

blindrage · Feb 6, 2013

im running gtx 660 ti on a z77a-gd65 msi board . when i use gpu-z it showes my gpu running @ x8, so i ran the test to see if it would kick in to 16x and it did not. any suggestions

Crap Daddy · Feb 6, 2013

First pci-e slot?

lyndonguitar · Feb 6, 2013

The specs on his mobo says three times x16

edit: i didn't quite understood the specs site. the basic specs said... Gen3 (16, 8, 4), while the detailed specs mentions 3 x PCIe 3.0 x16 slots only, no mention of 8x/4x mode

oh well nvm

blindrage · Feb 6, 2013

yes it is pci x16 x3 3.0

terrastrife · Feb 7, 2013

the board is, 8/8/0 or 8/4/4. there is no physical 16x link.

TRWOV · Feb 7, 2013

socket 1155 Ivy Bridge CPUs only have 16 PCIe 3.0 lanes so if you go SLI you get 8/8. The chipset has 8 extra PCIe 2.0 lanes (4 1x slots + 1 4x slot).

R00kie · Feb 7, 2013

your chipset only supports up to 16 lanes of PCI-Express, the rest is reserved for your peripherals and so on. You would not have had more lanes unless your board is equipped with a PLX chip which I don't think it is...

terrastrife · Feb 7, 2013

^uhh guys you two, the board doesn't have a 16x slot at all. it has an 8/8/0 or 8/4/4 layout.

R00kie · Feb 7, 2013

it has, they are halved as you have two cards in your PC

terrastrife · Feb 7, 2013

there is no 16x electrical link to a single slot on this board.
the first blue slot is hardwired as 8x
the second slot is hardwired as 8x but has switches to swap 4 lanes to
the third slot with is hardwired as 4x

I am guessing this was done as PCIE 3.0 switches are expensive, and this, being a mid range board, they would rather save money.

R00kie · Feb 7, 2013

Seriously? A mid-high end board with an x8 main PCI-Express? You're kidding right?

terrastrife · Feb 7, 2013

Well it is PCIE 3.0 so it's the same performance as a 16x PCIE 2.0 slot.

But having a look at the photos of this board close up, the specs and the hardware layout on the motherboard don't match up. I was taking my information from text, which may be based on an older or reviewer board.

Looking at the board itself it has hardware for 16/0/0 in addition to 8/8/0 and 8/4/4, but there is also the possibility the BIOS is limited.

R00kie · Feb 7, 2013

terrastrife said:
16/0/0 in addition to 8/8/0

that is more likely...
But seriously, nobody in a heck's name would ever put a single PCI-Express on x8 on a single card for the first slot in this stage of time...
The OP has two cards and I quote "two" cards, that is why his lanes are split.

terrastrife · Feb 7, 2013

They should, I'm pretty sure most people would pick saving say, $25 (or more) on a motherboard because with a single card you really aren't going to notice a difference, and with two, it's just the same (or better as there is no latency or any other issues involved with switches).
Of course, if you had a PCIE 2.0 video card you would probably see a few percent drop in performance.

Crap Daddy · Feb 7, 2013

gdallsk said:
The OP has two cards and I quote "two" cards, that is why his lanes are split.

This. By the specs he runs SLI, therefore he has 2 x 8.

System Name	franknstien
Processor	i 3770
Motherboard	msi z77a-gd65
Memory	8 gb
Video Card(s)	2 g msi gtx 660 ti and 2 gb pny gtx 660 ti
Storage	500 gb
Power Supply	rx-1000 ae
Software	win 7 64

System Name	Old Fart / Young Dude
Processor	2500K / 6600K
Motherboard	ASRock P67Extreme4 / Gigabyte GA-Z170-HD3 DDR3
Cooling	CM Hyper TX3 / CM Hyper 212 EVO
Memory	16 GB Kingston HyperX / 16 GB G.Skill Ripjaws X
Video Card(s)	Gigabyte GTX 1050 Ti / INNO3D RTX 2060
Storage	SSD, some WD and lots of Samsungs
Display(s)	BenQ GW2470 / LG UHD 43" TV
Case	Cooler Master CM690 II Advanced / Thermaltake Core v31
Audio Device(s)	Asus Xonar D1/Denon PMA500AE/Wharfedale D 10.1/ FiiO D03K/ JBL LSR 305
Power Supply	Corsair TX650 / Corsair TX650M
Mouse	Steelseries Rival 100 / Rival 110
Keyboard	Sidewinder/ Steelseries Apex 150
Software	Windows 10 / Windows 10 Pro

System Name	X6 \| Lyndon-ROG
Processor	Intel Core i7-8700k \| Intel Core i7 6700HQ
Motherboard	Gigabyte Z370 Aorus Gaming 5 \| Asus ROG-GL552VX
Cooling	Deepcool Captain 240EX
Memory	16GB Corsair Vengeance LED \| 8 GB
Video Card(s)	NVIDIA GTX 1080 8 GB GDDR5X \| NVIDIA GeForce GTX 950M 4GB
Storage	SSDs: 500GB, HDDs: 2TB, 2TB, 3TB \| SSD: 250GB, HDD: 1TB
Display(s)	Samsung 49" CHG90 3840x1080@144Hz, Panasonic 32" HDTV, \| 15.6"1080p
Case	Cougar Panzer Max
Audio Device(s)	HyperX Cloud II \| Corsair Gaming H1500 7.1 \| ROCCAT Kave 5.1 \| Edifier M3200
Power Supply	EVGA 750GQ
Mouse	Logitech G403 \| Razer Deathadder Chroma \| Logitech G302 \| Mad Catz Cyborg R.A.T. 5
Keyboard	Corsair Vengeance K70 Cherry MX Red
Software	Windows 10

System Name	franknstien
Processor	i 3770
Motherboard	msi z77a-gd65
Memory	8 gb
Video Card(s)	2 g msi gtx 660 ti and 2 gb pny gtx 660 ti
Storage	500 gb
Power Supply	rx-1000 ae
Software	win 7 64

Processor	4GHz intel i7 950
Motherboard	GA X58-USB3 F5
Cooling	Noctua C12P
Memory	48GB G.Skill RipjawsZ
Video Card(s)	EVGA GTX 480 873/1746/1848
Storage	Intel 520 Series
Display(s)	HP 2210m
Case	Antec 300
Power Supply	Antec True Power New 750
Software	Windows 8 Pro

gpu x8 not x16

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Audio Device(s)	Onboard
Power Supply	Dell 220w
Software	Windows 10 64bit

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Motherboard	Strix B550i / B450i Aorus Pro
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Case	Corsair 2000D / Cougar QBX
Audio Device(s)	Yamaha RX-V379 / Realtek ALC1220
Power Supply	Corsair SF600 / BeQuiet SFX Power 2 450W
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Keyboard	Drop Sense75 with WQ Studio Morandi's
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Software	Win 11 Pro 64Bit