First, let me introduce myself as this is my first post on Planet-Z. I'm a music producer/engineer from Croatia. I've been in the music business for more than 20 years, all from cutting analogue tape, Atari era, ADAT era to early and latest hardware and native DAW's. I also must apologize because I'm actually not a SCOPE user but a very good friend of mine is probably one of the most advanced SCOPE gurus (several SCOPE cards + Pulsar2 cards across several computers...) and I've been listening to his stories and struggles with SCOPE from the beginning of it's era.
Now to the point,
As I'm in the middle of computer upgrade (2 computers) for my studio and have same high demands for native 33MHz 32bit PCI slots as SCOPE users, I've taken Planet-Z as a reference for my research because of the fact how PCI hungry SCOPE cards are and lot of user experience posted here, not to mention guidelines and advices from some quite experienced moderators.
For now, actually, I found more chaos here than help, considering how much different versions of SCOPE/Pulsar/luna cards exist, various operating systems from XP to Win7 32/64bit, and even Win8.1 64 bit. For now I've read few mainboard/chipset related threads including your famous 23 page masterverb thread.
The greatest paradox of all is claim that new Haswell 1150 motherboards work OK with SCOPE, but 1155 Ivy Bridge motherboards based on same PCIe-PCI bridge chips do not. Also, putting all 1155 motherboards to same consideration is not correct as some 1155 Sandy/Ivy Bridge chipsets have native legacy PCI support within PCH (Q67, Q65, B65, Q77, Q75, B75) and do not require PCIe-PCI bridging. However, I've found only two users here who actually tested motherboards based on these native PCI chipsets and their results were worst of all! One was running some cheap MSI B75 board with 6 masterverbs and other some microATX Q77 board with only 3 masterverbs running on Win8.1 64bit (btw, in my opinion worst OS for realtime audio platform). Although 1155 native PCI fiasco is based on few not so convincible cases, I've put on hold my Q77 DFI motherboard purchases and decided to focus and investigate PCIe-PCI bridge solutions in detail and perhaps go with 1150 Haswell industrial mainboard equipped with best PCIe-PCI bridge.
There are few different PCIe-PCI bridge chips used on most 1155 and 1150 motherboards. Asmedia ASM1083 and ITE IT8892E are most common. Asmedia ASM1083 can be found on Asus Haswell mainboards and it supports maximum of 3 PCI bus masters. There is also Asmedia ASM1085 with 5 PCI bus masters support. I've recently discovered Pericom PI7C9X PCIe-to-PCI Reversible Bridge and found it on some industrial motherboards of my interest. ITE IT8892E featuring 4 PCI bus masters is most common on various 1155 motherboards, some 1150 as well on some industrial motherboards.
It would be of great interest to SCOPE community if someone is able and willing to test several PCIe-PCI bridges with same SCOPE configuration and same OS. It would be even better to test same PCIe-PCI bridges on 1150 and 1155 and native PCI 1155 motherboards, but also all with same SCOPE configuration and same OS

About the mainboards,
I found lot of users here buy and use various colorful consumer gamming motherboards. They also claim some 1150 motherboard is the only one with 3 PCI slots. Other put their cards on expensive and overblown server boards with 4 gigabit LAN's and some completely irrelevant and not needed integrated peripherals for DAW usage. But, what about industrial motherboards?! Industrial motherboards are exactly what we need! They're made for 24/7 operation, high quality design and components, production lifespan of usually 5 years and best of all they offer great legacy compatibility especially when PCI slots are in question, all with a moderate price tag. There are Haswell and Ivy Bridge motherboards with 6 and even 7 legacy PCI slots available! There are also few Haswell motherboards featuring ISA slots along with PCI and PCIe

Here is my selection of industrial motherboards:
Fujitsu 1150 Haswell (Pericom PI7C9X PCIe-to-PCI bridge):
http://www.fujitsu.com/fts/products/com ... 3236s.html
http://www.fujitsu.com/fts/products/com ... 3235s.html
DFI 1150 Haswell (ITE IT8892E and Asmedia ASM1085 PCIe-to-PCI bridge):
http://www.dfi.com.tw/products/ProductD ... Page=false
http://www.dfi.com.tw/products/ProductD ... Page=false
http://www.dfi.com.tw/products/ProductD ... Page=false
http://www.dfi.com.tw/products/ProductD ... Page=false
Fujitsu 1155 Ivy Bridge (native PCI - Q67 chipset):
http://www.fujitsu.com/fts/products/com ... 16018.html
DFI 1155 Ivy Bridge (native PCI - Q77, Q67, B65, C216 chipsets)
http://www.dfi.com.tw/products/ProductD ... Page=false
http://www.dfi.com.tw/products/ProductD ... Page=false
http://www.dfi.com.tw/products/ProductD ... Page=false
http://www.dfi.com.tw/products/ProductD ... Page=false
http://www.dfi.com.tw/products/ProductD ... Page=false#
Fujitsu motherboards cost cca. 150-200EUR. DFI cost cca. 250-300EUR.
There are several other industrial motherboards manufacturers like JetWay.
Supermicro X10SLA-F (mentioned on Planet-Z) looks quite fine and features 5 PCI bus masters based on Asmedia ASM1085 PCIe-to-PCI bridge. Supermicro is first class motherboard manufacturer.
http://www.supermicro.com/products/moth ... 0SLA-F.cfm
That's all from me for now

Best regards,
Suad