I started using a sound card Asus Essence ST and progressed from there - My system is leaps and bounds from where it started - its a long way on from 12 months ago with most of the work going into the system front end - Audio PC
If you keep your soundcard these are a few suggestions - sorry if you have already done or know these, sorry if you are not interested, just in case you are.
1. Dedicate the PC - move the PC to a fanless Chassis like a streacom case or similar quite a few about. The slimine streacom cases are appealing but limit your options due to space - you will to have to use a PCIE riser card for the soundcard for example - these are generally not great but they are cheap and readily availabble
Get all the fans out reduces noise in the mobo, having just the hard drives in there you will use - def use a seperate HD for storage to Operating System - dont put your music on the OS Drive. If you have to have a fan
you can by fan filters
Then line the case as best you can with
this non conductive product for emi / rfi absopbsption and reflection loss (lots of details on another forum of how best to use this stuff)
2. Power - using these types of cases limits your options anyway but you really want to power the computer from a Linear Supply -
something like this is ideal ( I was the first person to have one of these, it was designed for me, Sean has then made it available to buy, mine has worked perectly for years now) - but spec'd to your needs i.e. rails and voltages. He can help you, he helped me and we did it from scratch.
This powers the CPU directly into the CPU 4 Pin on the mobo and into a Pico PSU -
I would buy this unit for that
You can have this Linear Power Supply be multi rail - I have one 12 v rail for cpu, one 12v rail for the pico psu (this plugs into the motherboard atx 12 pin slot) I then have a dual rail of 12v and 5v as the Asus Essence ST Sound card needed both. The more rails the price increases but its neat powering the whole computer from the same supply. Mine is a beast with Massive Kendeil Capacitors - about 22000 UF of capacitance more than a lot of power amps - it will run my I7 based pc pretty much full power but its never had to
3. Use an SSD as your OS Hard Drive - smaller the better. Also using one to store your music is better also than a normal HD
These are worth the small price tag for your SSD amazingly
3.1 - Power to your SSD Drives - I strongly advise to power your SSD's Especially the OS SSD from its own 5V Power supply - cheaply from something like a terdak linear power supply from ebay, another Linear from Custom HiFI Cables - or from a battery based supply. JCat Batteries are great but no longer available I dont think I have 2 of them.
4. Music playing software - everyone has their favourite - for me there is no going back from JPlay using Ultrastream - with JPlay 6.2 and Minimserver as the library JPLay stands on its own- the timing improvement of the music is addictive - free demo avilabe for this and very clear and easy instructions to set it up
5. Bios optimisations - you want to run the computer using as least power as possible so underclocking the cpu etc, and disabling a lot of options etc You can find info on this on another forum.
6. Operating System optmisations - I dont know what OS you are running - Computer Audio Design has some free scripts for win 8 and 8.1 you run to shut down many windows or mac services so Windows runs purely barebones. These are free and the difference they make is huge - I had to undo these the other day and my system was unlistenable until I had run the script again. This works because the PC is purely dedicated to audio. There is an undo script to put everything back to how it was but once you have done it most things dont work so bear that in mind.
Two Others Fidelizer and Prosess Lasso - I would consider these now - each on their brings a benefit but all 3 for me is where its at.
7.
Cables Usb and Sata - I wont go into this but once you have done the above this is the next thing to try. I personally would stay clear of the usual cable suspect Chord QED etc. There are some boutique sellers like PPA and Pachanko that you can buy from
here also that put a lot of work into these, all hand made, to me much better
There are lots of other things you can do as well - this is just some very basics - you can get a lot of really useful info on other forums where people really well document what they have done. This is all long before the signal gets to upgrades on the USB Interface.
If you think what you have done i.e. Ifi and JitterBug has been an improvement wait until you do some of the above.
There will be a lot of negative comments on all this there always is but if you try these let us know how you get on. All the best