ThomasT wrote: Tue Dec 17, 2024 5:59 pm
garyb wrote: Tue Dec 17, 2024 4:52 pm
XITE-1 is about equivalent to 6-10 15dsp cards depending on how you use it.
You really mean 10 times 15 DSP cards? So 150 versus my current 21. 5 times more DSP power?
I use it mainly for mixing and routing. I use the 64 channel mixer. A lot EQ, some comps. Sometimes reverb.
"depending on how you use it" are the (Gary´s) key words.
You already think
"10 times 15 DSP cards" which is much too simple.
In it´s main 4 DSP slots,- XITE-1 uses different Sharc DSPs (ADSP-21369 / 333MHz) than ancient Creamware cards (ADSP-21065L / 66MHz).
There are 3 in each of these 4 DSP slots = 999MHz per slot x4 = 3.996 MHz + 6 of the old 66MHz chips (396MHz).
When doin´ only the
math, in a total, that´s 4.392 MHz (~ 4.4GHz) raw DSP power vs. 10x 15 DSP x 66MHz (= 9.9GHz).
So,- that can not be in real world and IMO, it´s better to see it different:
Each DSP slot in a XITE-1 houses 3 of the newer Sharc chips,- and w/ 3x 333Mhz, such slot is more or less an equivalent to
ONE 15 DSP card (990MHz).
In opposite to a PCI card system using ribbon cables interconnecting 3 PCI cards inserted into host computer´s PCI slots,- you now get quasi 4 "cards" (4 slots w/ 3 large DSPs) w/ XITE-1.
And then,- there are no ribbon cables.
Instead, these are replaced by an array of legacy Sharc DSPs.
DSP #3 - #6 handle communication with the 4 "DSP slots" (DSP # 7 - #18),- and DSP #1 and #2 run soft-/ hardware I/Os, VDAT and some other stuff in addition,- p.ex. help w/ backwards compatibility.
And there´s RAM inside a XITE-1,- each of the newer SHARC chips has.
XITE works different compared to a DSP card and a big advantage of it´s newer and way more powerfull Sharc DSP chips is assigning bigger devices to just only 1 DSP,- means p.ex. more polyphony from synth on a single chip vs. spreading the load across several smaller DSPs.
This is also an advantage for mixers when these are optimized for XITE.
So, purchasing devices from developers owning a and designing for XITE, enshures better XITE optimization.
You´ll recorgnize,- legacy ZARG "sc edition" devices (Ambient v3 and Orion Custom v3 sc edition) work better on XITE than the big and very DSP/ Async hungry Zarg devices like Solaris v5, Quantum Wave and Rotor EX.
So, you don´t have 4 "virtual" 15 DSP cards only as also you don´t have 10 of these per sé.
I own 2 PCI card systems and XITE-1.
I never ever ran out of raw DSP power w/ XITE-1,- but I ran out of available communication lanes w/ large(r) projects.
The SAT (Async) connections across DSP chips and between host computer and XITE become the bottleneck sooner or later,- depending on how you use the machine.
You have control of DSP load and Async percentage in a Scope project and manual DSP assignment sometimes helps a lot,- but not always.
Legacy "Creamware" and 3rd party devices aren´t optimized for XITE-1 always and there are some which will never be.
Company out of biz and/or coders gone and devices being locked are 2 reasons why not every single device from the past and being used w/ the PCI cards can be optimized for XITE-1.
But, w/ every new SCOPE release since v5, auto DSP assignment for XITE-1 was improved and I´m sure that will continue w/ upcoming update.
XITE itself is a great piece of gear,- but SCOPE itself really needs the 64Bit related bug fixes, fixes of WAVE and ASIO driver and improved MIDI CC assignment w/ total recall still.
Bud