£250 motherboard/cpu combo

Are you building a new PC? If so, save some money on the CPU and go with a better GPU.

Anyway, I'll come up with a combo from both intel and AMD.

Slightly over budget intel:

PCPartPicker part list: http://uk.pcpartpicker.com/p/128cR
Price breakdown by merchant: http://uk.pcpartpicker.com/p/128cR/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/128cR/benchmarks/

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor (£168.94 @ Amazon UK)
Motherboard: Asus Z87-A ATX LGA1150 Motherboard (£104.24 @ Scan.co.uk)
Total: £273.18
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-29 13:29 GMT+0000)

Another intel (honestly could just go with a non-k 4670 and a cheaper motherboard):

PCPartPicker part list: http://uk.pcpartpicker.com/p/12a0O
Price breakdown by merchant: http://uk.pcpartpicker.com/p/12a0O/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/12a0O/benchmarks/

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor (£168.94 @ Amazon UK)
Motherboard: ASRock Z87 Pro3 ATX LGA1150 Motherboard (£71.84 @ Scan.co.uk)
Total: £240.78
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-29 13:32 GMT+0000)

AMD (slightly over budget again, very nice CPU cooler):

PCPartPicker part list: http://uk.pcpartpicker.com/p/pCJd
Price breakdown by merchant: http://uk.pcpartpicker.com/p/pCJd/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/pCJd/benchmarks/

CPU: AMD FX-8320 3.5GHz 8-Core Processor (£112.79 @ Aria PC)
CPU Cooler: Noctua NH-D14 65.0 CFM CPU Cooler (£64.90 @ Amazon UK)
Motherboard: Asus M5A99X EVO R2.0 ATX AM3+ Motherboard (£95.98 @ Amazon UK)
Total: £273.67
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-29 13:33 GMT+0000)

AMD under budget (still a nice CPU cooler):

PCPartPicker part list: http://uk.pcpartpicker.com/p/mFN6
Price breakdown by merchant: http://uk.pcpartpicker.com/p/mFN6/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/mFN6/benchmarks/

CPU: AMD FX-8320 3.5GHz 8-Core Processor (£112.79 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£23.98 @ Scan.co.uk)
Motherboard: Asus M5A99X EVO R2.0 ATX AM3+ Motherboard (£95.98 @ Amazon UK)
Total: £232.75
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-29 13:34 GMT+0000)

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What are you looking to do with the pc?

EDIT: Ok. The cheaper intel motherboard isn't crossfire compatible, so bear that in mind.

Also if you're getting a new motherboard you may have to factor in the price of a new copy of windows.

Oh, and I'd say you'd be good with just an upgrade to the FX 6300.

The 4100 you have now is bulldozer architecture, which was a complete flop and performs worse than the phenoms it was intended to replace. The piledrivers (4300/4320/4350/6300/6350/8320/8350) improved on it massively.

Intel:

i5 4750
http://www.amazon.co.uk/Intel-Graphics-BX80646I54570-Generation-Technology/dp/B00CV3E3WK/ref=sr_1_1?ie=UTF8&qid=1385732047&sr=8-1&keywords=i5+4570

Asus Z87-A
http://www.amazon.co.uk/Z87-A-Motherboard-Express-2-0x16-6-0Gbps/dp/B00CXK57MG/ref=sr_1_1?ie=UTF8&qid=1385731975&sr=8-1&keywords=z87+motherboard

Total: 255.74

AMD:

FX8320
http://www.amazon.co.uk/AMD-FX8320-Edition-4-0GHz-Socket/dp/B009O7YU56/ref=sr_1_1?ie=UTF8&qid=1385732095&sr=8-1&keywords=fx+8320

Asus M5A99X Evo R2.0
http://www.amazon.co.uk/M5A99X-R2-0-Motherboard-PCI-Express-iControl/dp/B008RPZUZK/ref=sr_1_7?ie=UTF8&qid=1385732136&sr=8-7&keywords=am3%2B+motherboard+asus

Total: 208.98

Your current motherboard does not support processors over 95W. This means that the best you could get is an FX 6300 which is still good.

As long as your motherboard is rev. 5.x (you should be able to tell by looking at it):
rev 3.1: http://www.gigabyte.com/products/product-page.aspx?pid=3833#
rev 4.0: http://www.gigabyte.com/products/product-page.aspx?pid=4028#
rev 5.x: http://www.gigabyte.com/products/product-page.aspx?pid=4125#

Otherwise it doesn't really support the piledriver series of FX CPUs. Go to 'Support & Downloads' and then 'CPU Support List' to see which ones it does support.

It's ok, although I don't see why you wouldn't go with a cheaper 8320 which is just an 8350 clock lower at stock (which you can overclock easily) and a nicer motherboard.

That motherboard isn't good for overclocking, and it doesn't have full sli support.

Yeah, I'd say so. The M5A99X is really great (regret not getting one myself!). DOn't worry about overclocking (if you are worried), there are a bunch of good guides around. Including this:
http://www.overclock.net/t/1348623/amd-bulldozer-and-piledriver-overclocking-guide-asus-motherboard#