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Maximus V Extreme: Pushing LGA1155 To Its Limits

X-ROG
Level 15
For you extreme overclockers and 4-way GPU nuts who have been waiting for the Extreme board to arrive: the time is.. very close. Like the Maximus IV Extreme(-Z) last year, the Maximus V Extreme represents ROG team's tailoring to the very high end. How exactly? Read on!



Most cases support wider rather than taller motherboards, so the EATX form factor is be more compatible for existing chassis.



10 SATA is split across the 8 right angled to the side of the board (Z77+ASMedia), one on the base (Z77) and one on the mPCIe Combo card (Z77). There are two sets of (black) USB 2.0 pin-outs for four ports and two (red) USB 3.0 front panel pin-outs too. Nestled into the bottom corner is the BIOS switch, and above it the SubZero Sense K-type connector.

4-way SLI/CrossFire-X & PCI-Express 3.0
4-way SLI/CrossFire-X and all the CPU power you can muster has been a staple diet of performance enthusiasts for as long as... well, 4-way GPU has been available. Where the Maximus V Formula serves up a 3-way GPU game-o-thon, the Maximus V Exterme ups the ante with full 4-way support supplied over its four, red, PCI-Express 3.0 slots shown above.

That part is easy, however it's how they are connected that makes the Extreme different.



As the LGA1155 CPUs have only one PCI-Express 16x slot for graphics, this is connected to a hidden PLX PCI-Express 3.0 multiplier nestled under the central ROG heatsink, taking its place between CPU socket above and the PCIe slots it connects to beneath. The PLX chip multiples the single 16x by two, so that extreme gamers and benchmarkers are served up 8x bandwidth across all four PCIe slots. However, adding an extra chip also adds a data hop, which means a bit of additional latency. While necessary for 4-way users, 2-way benchmarkers (normal gamers won't notice) don't want the drop in scores. It's a similar situation that was firstly highlighted on older motherboards with the NF200 chip. In light of this, ROG engineers took the time to device a custom system of PCI-Express lane switching where if only one or two graphics cards are installed then the PCI-Express 3.0 lanes are reassigned to connect directly to the CPU, bypassing the PLX chip altogether and completely minimizing the latency.

Intel Thunderbolt & the Rear I/O layout
Just like the P8Z77-V Premium that recently launched, the Maximus V Extreme adds an Intel Thunderbolt port to its hardware lineup at the very top of the rear I/O.



The mPCIe Combo card familiar on all Maximus V boards (but vacant in the picture above sorry) is placed next to it. Like the Formula this comes with an 802.11n WiFi card bundled in the mPCIe slot, with the mSATA slot on the opposite side free to upgrade.

Next are two buttons representing the ever useful BIOS Flashback at the bottom and Clear CMOS at the top. Next to these are four USB 2.0 ports, with the bottom white slot doubles up as the BIOS Flashback socket, but can be used as a normal USB port in Windows. Four USB 3.0 ports (in blue), Intel Gigabit LAN, DisplayPort and HDMI video outputs, optical S/PDIF and 7.1 channel HD surround sound. The PS2 keyboard/mouse port is still there because extreme overclockers can prefer to turn off the USB entirely, working entirely through the legacy I/O chip that is unaffected by extreme changes to frequencies across the board. Let's not forget the gamers too - mechanical keyboards are bringing back the PS2 connector as it can accept more simultaneous key presses.

OC Key, VGA Hotwire & Subzero Sense
Remember the OC Key from the Rampage IV Extreme? That comes bundled in the Maximus V Extreme box. In fact, the entire set of OC Key, VGA Hotwire and Subzero Sense is added to its feature set.

Up in the top right there's also the debug LED, slow mode switch for extreme OCers, ProbeIt readouts, the Go Button for on the fly OC Profile switching, and four VGA Hotwire 3-pinouts.



The new ROG MATRIX HD 7970 and recently released GeForce GTX 680 DirectCU II both have VGA Hotwire ports on them that sync-up with both these Extreme boards.

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stefpats
Level 7
At last! it's here.Thanx asus,was about time to upgrade from maximus IV.

Maybe sent me one over for testing :cool:
Specs:
Intel Core i5 2500k @4.4GHz
Gigabyte GA-Z68X-UD3H-B3
Dual Gigabyte Radeon 6950s
NZXT Switch 810 Case
Antec 620 Cooler
Silver Stone 850w PSU
Corsair 60GB GT SSD
1TB Seagate Hard Drive

Brilliant design is brilliant!

Tis bit of a set back to see no SFXIII Audio Chip & Dual Ethernet cut back to One. :confused:
The I/O portion doesn't look anything extreme ...

Just wondering will that ROG on the center of the motherboard glow like its predecessors?

Taurus_G4 wrote:
Just wondering will that ROG on the center of the motherboard glow like its predecessors?


Yeap, that's what JJ said in one of his the videos - if I recall correctly...

Zka17 wrote:
Yeap, that's what JJ said in one of his the videos - if I recall correctly...


Don't look to me I see no wire poping out connecting to motherboard. Or maybe tis all hidden underneath. :cool:

M5E board uses supposedly uses PLX PEX8747 PCI Expres Gen 3 Switch 48 lane/5ports to fan out the x16 port from the CPU to four ports of x8

Despite the GPU being able to communicate which each other directly having a x16 uplink port may be a theortical bottleneck when four GPU are used.

What does ASUS think of such a scenario? How much upstream bandwidth is really needed when four GPUs are being used ? Will the x16 be enough?

Are you disclaiming the bandwidth on these boards?

Some reviewers have done basic tests but that is not enough. I recall Linus doing a 4 way comparison with 3dmark with minimal difference.

Intel's mainstream chipsets were never really 'intended' for such extreme uses and various OEMs began adding switches over the years onto their boards to adapt the PCI slots to enthusiast requirements. Examples being this board with the PEX8747 for the graphics ports or a competitor brand using the older Gen2 PEX 8608 to fan out more x1 lanes for extra slots/SATA/USB/LAN.

Some manufacturers do offer a disclaimer saying bandwidth will be limited if certain device/slot combos are used.

This is a nice board but are manufacturers trying to squeeze too much out of mainstream boards by producing many specialist and some niche boards which end up subsitute cons for pros.

Its a really crammed boards, three power sockets, two PLX switches and a commenter posted about the audio/lan and the target users. With the price these boards will end up having, end users may have a hard time choosing wether to go down the ROG 2011 or ROG 1155 route.

X-ROG
Level 15
Well x16 is all that's available on that platform and people want to do 4-way SLI so it's the best answer. Remember Gen-3 gives twice the bandwidth too. It's the same scenario that we had with the NF200s, or PLX chips way back to the Blitz Extreme on P35. Whether it was meant to do so is regardless. Pro OCers don't want to pay $500+ for a CPU when a $250 one clocks higher under LN2 for limited threading benchmarks. Benchmarkers will choose whatever is faster for their specific application. Outside of benchmarking though, people won't be able to tell the difference in gaming with 4-way SLI/CF.

So, I don't really understand your question - you say there's minimal difference but you're disputing the the bandwidth available??

Reviewers have to commit to two sets of tests:

Get both an LGA2011 board and LGA1155 to compare 4-way SLI/CF on both platforms. Firstly throw in an LGA2011 CPU with 2 cores disabled and match it with a 2700K (as both are SB cored) with clock-for-clock OCs to see the difference at PCIe level. Then unlock everything on the LGA2011 CPU, throw in a 3770K instead on the LGA1155 platform and max the OCs under LN2 on both. Then do the same set of tests again. I guess, 6.xGHz LGA1155 will outperform any difference in PCIe bandwidth in low-threaded games, but it will be interesting to see.

But how many end users OC under LN2? But then these are extreme boards designed for pro OCers? Many schools of thought. Many user scenarios. No one answer. Both platforms have their advantages and disadvantages. If you don't have this kind of innovation and choice, the market becomes stagnant and uninteresting. 😉

It's like selling a super car: it's basic application is to go fast. In the right hands you can do marvelous things at speed. In the wrong hands you lose your life by crashing. They don't stop selling fast cars when a normal car can get you from a to b though. 😉

So freakin beautiful
Core I5 3570K @ 4.6Ghz
Asus Maximus V Gene
G.Skill 8GB DDR3 2600 @ 2800
Vanilla EVGA GTX 670's in SLI
Corsair AX1200
Acer GD235hz
Antec 1200