I guess it depends on what counts as a computer. I have 4 retro cases but about 8 motherboard / CPU / Ram bundles. So I could that as 8 PCs that I can get up and running in about 2 hours. I only ever have one retro PC plugged in though, alongside my main PC.

At the moment I have two that I actively use. One is a dedicated gaming/VR setup. The other is my slightly older system I use for studio/misc work.

Answering for home, not work.
4 computers used regularly, sorted by order of use:
-i5-4590/8GB/GTX 750Ti/Win10 (web browsing, modern gaming, GOG games from Win9x/XP eras)
-Packard Bell Multimedia C110/POD 200/32MB/S3 VirgeGX/Audician 32 Plus/DreamBlaster X2/Roland MT-32/MS-DOS 6.22 (regularly used for MS-DOS gaming)
-Lenovo V460 14" laptop/i3-350m/8GB/integrated Intel graphics/MX Linux 17.1 (used for finances)
-Dell Dimension 4100/P3 933/512MB/GF3 Ti200/Audigy/WinME (play the occasional Win9x game here when the GOG version on Win10 doesn't cut it)

I also have many systems that are either fully functional or nearly functional that are hardly ever used or in storage. These include:
-HP Vectra VL/P2-400/256MB/Voodoo 2 SLI/Win98SE (dead proprietary PSU)
-486 DX2-66/CL-GD5428 VLB/8MB/Audician 32 Plus/MS-DOS 6.22 (graphics card going bad)
-multiple WinXP systems from various eras (Core2Duo, P4, AthlonXP) that I don't use

Another week, another strange Muz question 🤣

Just one modern desktop PC, and one crappy and outdated laptop. I have two retro PCs (a P1 133 and a P2 400), but they're on the other side of the country back in my hometown in my parents' house, and I don't have space for them here. It's PCem for me these days.

Muz wrote:

... and the other is laptop. ...

Details, please. Your desktops do not deserve all of the love.

Out of all of the computers I have, five of them are permanently set up, but there's one spare computer that I have hooked up ATM because I plan on using it for something, so I'll list 6 computers in order of usage:
- Dell Optiplex 7010 (i3 3220/8GB/Integrated Intel GPU/Windows 7) - used for internet browsing.
- Custom build in a Dell case (i3 6100/8GB/GTX 970/Windows 10) - used for advanced video editing.
- Dell Optiplex 745 (C2D E6600/4GB/GT 610/Windows 7) - used for DVD Video burning and analog video transfer, this is the spare machine I was talking about.
- Dell Optiplex GX150 (P3 1400/384MB/GF4 Ti4200/SB Live/Windows 98SE & 2000) - sometimes used for 9x gaming and floppy writing.
- Custom Built (Celeron 433/192MB/Rage Pro/Voodoo2/SB AWE64/Windows 95 OSR2.5) - sometimes used for 9x gaming and playing around.
- Custom Built (A64 3700+/2GB/Radeon X800/Windows XP) - sometimes used for XP gaming and playing around.

I have too many spare machines to list.

After a disaster (family threw out my multi-thousand dollar computer collection while "helping me move" when I was at work and couldn't get the time off), what I have left, purchased afterward, mostly:

8 BIT
Tandy Color Computer 2 - Not used due to a lack of software and accessories, but this is the same across all of the 8 bit systems I have.
Atari XE GS - Used only to play Missile Command, as the BASIC system halts when the return key is pressed, even if a simple PRINT "HELLO" command is entered.
Commodore 64c - Not used at all due to Commodore's idiotic power supply engineering causing the supplies to cook themselves to death under normal use, and then fry the C64 when the supply fails.

32 BIT
HP Vectra D2933A 486 66XM - Used to run any and all DOS and Win 3.11 software. Rocking an absurd 32MB of RAM and a failing 1GB HDD, this system would have been a multi-thousand dollar beast in its current configuration, back when it was released. I use it to make useless videos for Youtube.
AMD K6-2 500 @ 300 MHz - My first computer, though the original CPU was 300 MHz. I use it periodically to perform Windows 9X functions, and to test games that require a decent video card in DOS.
Apple Power Mac G4 M8493 - Acquired for $10 at a rummage sale, it is my only operational Apple computer since the disaster. Since it cannot run newer browsers, it's barred from most sites supported by Cloudflare. This makes it only useful now as a network Zip drive that still hasn't experienced the click of death.

64 BIT
Toshiba Satellite A205 - Used only when I need a Windows 7 system somewhere a desktop won't fit. The battery is dead, so it's only portable to places with AC power outlets. It's a terrible laptop, stripped down at the factory. Empty holes for the SD card slot and secondary HDD bay, with no electronics in either, and it cannot address any more than exactly 2GB of RAM.
Dell Inspiron 530 - Given to me as it was old and busted, I replaced some of the missing hardware and jackstands, and it functions, but is very finicky about RAM types. Running Windows Vista because I didn't want to reset a Win 7 OEM key for it. Used to test Windows XP-era software.
Intel Core 2 Duo - The dining room computer, used for anyone who happens to come over. Would be a decent system with a good video card and more RAM, but it's fine as-is. Mainly used for research and document printing, even though the two laser printers in the house are connected via WiFi.
Intel Core 2 Quad Q8200 - My primary desktop since 2008. Showing its age, as it is limited to 8GB of DDR2, which is causing problems in image editing lately. Overheats when tasked with extended video encoding, despite the thermal compound having been replaced, and the heat sink being clean.

INOPERABLE FOR NOW
Apple Mac Plus - Needs a lot of capacitors replaced, but first, I need a torx T15 driver with a long blade to even get it apart. Then it needs a bath, a new battery, any improvement mods I can make, and a mouse (which people want stupid money for).
Commodore 64 (x2) - Need replacement PLA chips and new power supplies.
486 Tower - Needs a DALLAS hack before anything can be done with it.
Packard Bell Desktop Pentium - Needs a DALLAS hack before anything can be done with it.
Pentium Tower - Needs a hard drive 8GB or smaller, which I do not have. Will likely be a Windows 95 system when I get it rolling.

Operational and ready to use on the power button switch - only two (desktop Phenom X6 and laptop HP 840 G3). None retro - Phenom will be soon 🤣 I'm starting to wonder what will I do with my other ~100 computers and many times over of parts 😕 Had some ideas but they are slipping away now...

currently i'm at 3, 5 if you count a Raspberry PI B and a Smartphone

My main PC
FX6100, 8GB-1600, RX560-4GB, 3TB HDD
My netbook
N2806. 4GB-1333, BayTrail HD, 120GB SSD
The one i'm working (it can be one of the 17 I have: 386, 586, PMMX, PII, PIII, C-D, PIV, PHT, PDC, A64)

I have...something like 15 computers, but use "only" 8 of them.

Main PC: i7-4930K @ 4.6GHz, GTX 1080 Ti, 32GB DDR3-2400, 1TB 860 EVO, 3TB HDD

HTPC: i5-4670 @ 3.8GHz, GTX 1050 Ti, 8GB DDR3-1600, 500GB 860 EVO

XP Gaming: PIII-S @ 1575MHz, 6800GT, X-Fi, 2GB DDR @ 300MHz/CL2, 500GB 7200RPM HDD

Win98 and DOS Gaming: an upgraded Dell XPS T550 w/ a Celeron-1400, Voodoo3-3500 AGP, Aureal SQ2500 (Vortex 2), 512MB PC100, 80GB 7200RPM HDD

For speed sensitive games, or games that don't sound quite right on the above system: 486-66, Cirrus Logic VLB card, Sound Blaster AWE64, 8MB RAM, DOS 6.22, 2GB CF card.

For internet access and music in my hobby room: Optiplex 780 USFF, C2D E8600 3.33GHz, 8GB DDR3-1333, GMA X4500HD, 256GB 840 Pro.

Server: Pentium M Dothan @ 2.66GHz, 2GB DDR2-533, Radeon X300, dual integrated GigE NICs, 120GB boot SSD, 3 x 8TB main HDDs, 3 x 8TB backup HDDs.

Mobile PC: Surface Pro 4, i5-6300U, 8GB DDR3-1600, Intel HD-520, 256GB SSD.

realnc wrote:

Another week, another strange Muz question 🤣

^^^^ This! 🤣

Xeon X5470 with GTX 770, 8GB RAM, onboard sound, Windows 7 32bit/64bit
Main PC, in regular use, connected to network and KVM

Phenom II X6 1090T with GTX 750, 8GB RAM, onboard sound, Windows 10 64bit
Daughter's PC, in regular use, connected to network

Core2Q Q9550 with GTX1030, 4GB RAM, onboard sound, Windows 7 32bit
HTPC, in frequent use, connected to network

Opteron 180 with GTX 560, 4GB RAM, Audigy 2 ZS, Windows XP SP3
Secondary PC, in frequent use, connected to network and KVM

Pentium III 1400 with GF4 4200Ti, 512MB RAM, AWE64 and SIMMCONN, MS-DOS 6.22+Windows 3.11/Windows 95/98/ME/2000
Main retro PC, in frequent use, connected to network and KVM

Pentium MMX 233 (ATX) with Voodoo3, 64MB RAM, SB16 CT2230 and NEC XR385, MS-DOS 6.22+Windows 3.11/Windows 95/98
Secondary retro PC, in seldom use, connected to network and KVM

Asus EEPC 1008HA with Windows XP SP3
Wife's old netbook, travel PC, in seldom use

386SX-16 with Oak 067, 5MB RAM, SB16 CT1740, MS-DOS6.22+Windows 3.11
Replica of my first PC, off-line

486DX2-66 with CL 5429, 64MB RAM, SB32 CT3670, MS-DOS6.22+Windows 3.11/Windows 95
Current time waster (ongoing Project, some would say), will be offline when I get bored

Pentium 4 3GHz with ATI All-in-Wonder 9600 Pro and Matrox Mystique 220/Rainbow Runner, 4GB RAM, SB Live SB0060 and LiveDrive II, Windows 98/XP
Unfinished but fun multimedia project, off-line

Pentium MXX 233 (AT) with Matrox Millenium II and Voodoo2, 256MB RAM, AWE64 and SIMMCONN, MS-DOS 6.22+Windows 3.11/Windows 95/98
No purpose, off-line, dust collector

Celeron 466 (AT) with Voodoo3 and S3 Trio64V2, 256MB RAM, SB16 Waveeffects CT4170, MS-DOS 6.22+Windows 3.11/Windows 95/98
No purpose, off-line, dust collector

3, the ones in my signature and an HP EliteBook 840 G3 laptop.

The only running computer nowdays is a Raspberry Pi the first version with the single core ARM11@1100Mhz, 512MB DDR@600Mhz, one fast microsd and the usual Debian linux.
Even if I often build many retro/"modern" computer I always find myself using the Raspberry as main machine.

Just curious, how do you use a RPi as a daily machine?

oeuvre wrote:

Just curious, how do you use a RPi as a daily machine?

Same way as any other computer, really. This one just happens to be very small 😀 You connect a keyboard, a mouse, a storage device, a monitor, and you've got a desktop machine:

https://www.youtube.com/watch?v=ZYPATphfGY4

How's browsing the web and youtube on that thing?

It's not possible. You have to pipe it to omxplayer with streamlink to watch anything. All the other media players Raspbian provides are unusably slow. Unless you use the experimenal GL driver with full or fake KMS, in which it'll be slightly better with a high risk of hard freezing (while disabling omxplayer - yay.)

I have 3 desktops. A 486, a Pentium 233 (or thereabouts), and my modern rig. I used to use them all but now I resort to emulation and modern system patching for older games. They just sit in a closet now. A) I just don't have the room to set them all up where I currently reside, and B) I just caved as it's far more convenient to do as much as possible on one system.

I also have a laptop which I only ever use at work and rarely when I'm away from home. Actually, most of my on-the-go gaming happens on my Switch now.

I have 6 Desktops I regularly use:

IBM PC AT (DOS)
Pentium 90 (DOS/Win3)
Pentium 4 (Win98)
Core 2 Duo (WinXP)
i9 (Win10)
MacMini (OS9/OSX)

Obviously the i9 is my daily driver, all the other machines are for vintage/retro purposes, generally gaming but also for some apps which will not run under modern windows.

I also have a laptop which generally remains uncharged as I can never really find a use for portable machines for very long. Also I set up a Win10 4770k machine for my girlfriend to use...which occassionally I have to use for support purposes. =)