Jump to content

16x vs 8x

Qtip1318
By Qtip1318
in Graphics Cards
 Share
Posted

hi guys i have been looking at some motherboards and i just wanted to know what the bottle neck would be when they talk about running more then one video card is sli or crossfire, what i mean by this is if you would have two 780ti's and where running them in sli at 16x/8x or 16x/16x. is there going to be a performance advantage that you can see? or what effect dose it even have 

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

no, it will be fine

Intel 3570k 3,4@4,5 1,12v Scythe Mugen 3 gigabyte 770     MSi z77a GD55    corsair vengeance 8 gb  corsair CX600M Bitfenix Outlaw 4 casefans

 

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

Even 8x and 8x is fine! :D

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

no it will be A O K

Hope I could help!

Specs: CPU: AMD FX-8320 @4.0ghz GPU: ASUS DCUII GTX 770 PSU: EVGA Supernova 750g CASE: Fractal Define R4 RAM: 8 Gigabytes ADATA 1333 Mhz MOBO: GIGABYTE GA-990FXA-UD3

 

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

Gpus have yet to fully saturate pci-e 2.0 x8.

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
Also, make sure to quote a post or tag a member when replying or else they won't get a notification that you replied to them.

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

Zero bottleneck. AMD cards can run on 4x with no issue. The PCIe bus has so much bandwidth, GPU's can't use all of it.

                    Fractal Design Arc Midi R2 | Intel Core i7 4790k | Gigabyte GA-Z97X-Gaming GT                              Notebook: Dell XPS 13

                 16GB Kingston HyperX Fury | 2x Asus GeForce GTX 680 OC SLI | Corsair H60 2013

           Seasonic Platinum 1050W | 2x Samsung 840 EVO 250GB RAID 0 | WD 1TB & 2TB Green                                 dat 1080p-ness

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

well thank you every one for the help… Maybe this is a dumb question but dose anyone know why they would use a 16x slot if they don't need all the bandwidth

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

well thank you every one for the help… Maybe this is a dumb question but dose anyone know why they would use a 16x slot if they don't need all the bandwidth

 

Because of all the #YOLOSWAG :)

 

No honestly: No idea, but it is most likely just a marketing scheme so that people may think that they actually need it. No GÅUs today can saturate a PCI-E 2.0 16x slot which is the same as a PCI-E 3.0 8x slot :)

Tor
Corsair Obsidian 650D - Intel 4770K CPU - Gigabyte G1 Sniper 5 - ASUS GTX 780 Direct CU 2 - Kingston Beast Hyperx Beast 16 GB RAM -  Corsair AX 1200i PSU - Samsung EVO drive 750 GB - Corsair AF series 120mm fans - Corsair H100i - Razer Blackwidow Ultimate 2013 edition - Razer Ouroboros - Razer Manticor - Windows 7 - Beyerdynamic MMX 300

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

well thank you every one for the help… Maybe this is a dumb question but dose anyone know why they would use a 16x slot if they don't need all the bandwidth

 

One doesn't need to come close to saturating a bus to derive benefit from its faster speed. While the benefit is small, faster transmission does mean better throughput.

 

Add up small improvements here and there in a system and the net result is a better performing rig. For the average enthusiast it is hardly worth it. But there are those who derive great pleasure out of pushing the envelope. There are also applications where even marginal performance improvements can pay for themselves.

80+ ratings certify electrical efficiency. Not quality.

 

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

We technically don't need PCI-Express 3.0 yet, but the "inventors" decided to push that forward anyways ($$).

It's also hype so people will get new motherboards (Intel, harrrooo! I see youuu!)

The performance difference, if there is any at all, is very tiny. We are speaking 1%-5% in most situations (which is like what...1 - 3 FPS?).

 

nVidia SLi requires at least X8 slots (X16 or X8). If X8 is too much of a bottleneck they wouldn't suggest it.

 

The theoretical bandwidth for PCI-Express is double every revision.

Examples:

PCI-E X16 1.0 = PCI-E X8 2.0

PCI-E X16 2.0 = PCI-E X8 3.0

 

This is why AMD didn't really jump on the PCI-E 3.0 bandwagon as quick as Intel...since most of their higher-end chipset motherboards (i.e. 990FX) has enough PCI-E lanes to run two (2) PCI-E X16 2.0 slots at full speed (with a few extra left over).

 

If an Intel board does PCI-E X8 3.0 + PCI-E X8 3.0 with SLI / Crossfire...it's the same as a AMD board with PCI-E X16 2.0 + PCI-E X16 2.0

Intel Z390 Rig ( *NEW* Primary )

Intel X99 Rig (Officially Decommissioned, Dead CPU returned to Intel)

  • i7-8086K @ 5.1 GHz
  • Gigabyte Z390 Aorus Master
  • Sapphire NITRO+ RX 6800 XT S.E + EKwb Quantum Vector Full Cover Waterblock
  • 32GB G.Skill TridentZ DDR4-3000 CL14 @ DDR-3400 custom CL15 timings
  • SanDisk 480 GB SSD + 1TB Samsung 860 EVO +  500GB Samsung 980 + 1TB WD SN750
  • EVGA SuperNOVA 850W P2 + Red/White CableMod Cables
  • Lian-Li O11 Dynamic EVO XL
  • Ekwb Custom loop + 2x EKwb Quantum Surface P360M Radiators
  • Logitech G502 Proteus Spectrum + Corsair K70 (Red LED, anodized black, Cheery MX Browns)

AMD Ryzen Rig

  • AMD R7-5800X
  • Gigabyte B550 Aorus Pro AC
  • 32GB (16GB X 2) Crucial Ballistix RGB DDR4-3600
  • Gigabyte Vision RTX 3060 Ti OC
  • EKwb D-RGB 360mm AIO
  • Intel 660p NVMe 1TB + Crucial MX500 1TB + WD Black 1TB HDD
  • EVGA P2 850W + White CableMod cables
  • Lian-Li LanCool II Mesh - White

Intel Z97 Rig (Decomissioned)

  • Intel i5-4690K @ 4.8 GHz
  • ASUS ROG Maximus VII Hero Z97
  • Sapphire Vapor-X HD 7950 EVGA GTX 1070 SC Black Edition ACX 3.0
  • 20 GB (8GB X 2 + 4GB X 1) Corsair Vengeance DDR3 1600 MHz
  • Corsair A50 air cooler  NZXT X61
  • Crucial MX500 1TB SSD + SanDisk Ultra II 240GB SSD + WD Caviar Black 1TB HDD + Kingston V300 120GB SSD [non-gimped version]
  • Antec New TruePower 550W EVGA G2 650W + White CableMod cables
  • Cooler Master HAF 912 White NZXT S340 Elite w/ white LED stips

AMD 990FX Rig (Decommissioned)

  • FX-8350 @ 4.8 / 4.9 GHz (given up on the 5.0 / 5.1 GHz attempt)
  • ASUS ROG Crosshair V Formula 990FX
  • 12 GB (4 GB X 3) G.Skill RipJawsX DDR3 @ 1866 MHz
  • Sapphire Vapor-X HD 7970 + Sapphire Dual-X HD 7970 in Crossfire  Sapphire NITRO R9-Fury in Crossfire *NONE*
  • Thermaltake Frio w/ Cooler Master JetFlo's in push-pull
  • Samsung 850 EVO 500GB SSD + Kingston V300 120GB SSD + WD Caviar Black 1TB HDD
  • Corsair TX850 (ver.1)
  • Cooler Master HAF 932

 

<> Electrical Engineer , B.Eng <>

<> Electronics & Computer Engineering Technologist (Diploma + Advanced Diploma) <>

<> Electronics Engineering Technician for the Canadian Department of National Defence <>

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

We technically don't need PCI-Express 3.0 yet, but the "inventors" decided to push that forward anyways ($$).

It's also hype so people will get new motherboards (Intel, harrrooo! I see youuu!)

The performance difference, if there is any at all, is very tiny. We are speaking 1%-5% in most situations (which is like what...1 - 3 FPS?).

 

nVidia SLi requires at least X8 slots (X16 or X8). If X8 is too much of a bottleneck they wouldn't suggest it.

 

The theoretical bandwidth for PCI-Express is double every revision.

Examples:

PCI-E X16 1.0 = PCI-E X8 2.0

PCI-E X16 2.0 = PCI-E X8 3.0

 

This is why AMD didn't really jump on the PCI-E 3.0 bandwagon as quick as Intel...since most of their higher-end chipset motherboards (i.e. 990FX) has enough PCI-E lanes to run two (2) PCI-E X16 2.0 slots at full speed (with a few extra left over).

 

If an Intel board does PCI-E X8 3.0 + PCI-E X8 3.0 with SLI / Crossfire...it's the same as a AMD board with PCI-E X16 2.0 + PCI-E X16 2.0

thanks man that is really help full

Link to comment
Share on other sites
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing Graphics Cards

×