[Noob question] How much improvement can be expected (Q9450 vs. i5/i7)

[Perene]

I always saw benchmarks but could not understand them. All I see are numbers that don't make sense.

I have this config:

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Q9450
DG41TY Intel MB (onboard video)

Corsair DDR2 PC2-6400 2 GB 400 MHz
Corsair CM2X1024-6400C4 1 GB

Samsung 753LJ (2 HDDs)
CaseMall 500W Total Power Plus - ALL-500TTP Power Supply

Windows 7-32

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-----------> The new PC I am selecting may be this one:


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Windows 7 or 8 - 64

Core i5 4460
ASUS LGA 1150 Z97M-PLUS (MB)
Kingston HyperX 8GB 1600MHz DDR3 CL10 DIMM HyperX FURY Black Series HX316C10FB/8

SSD Samsung 840 EVO 120 GB (used for the OS and a few things)
Samsung 753LJ (2 HDDs - used for the rest)

Seasonic ATX 520W S12II-520 Bronze Power Supply

Perhaps the GTX 650 will be used, but right now no video card. So consider this new config without the GTX.
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And for example, to render in Vegas PRO 11.0 28 GB from my camcorder in the best quality (JVC GZ-EX210, UXP, 2h46m) it took 20 hours in this computer. Saving the MTS in 1080p. Only a few additions to the original material.

I need to know how many hours will it take using the i5 4460 or i7 4770. At least a percentage if I choose one or the other.

Can you guys help me find out? If I can't have that info then I won't replace this old computer.

The encoded file, reduced from 28 to 8 GB:

Format : MPEG-4Format profile : Base Media / Version 2
Codec ID : mp42
File size : 8.74 GiB
Duration : 2h 46mn
Overall bit rate : 7 503 Kbps
Encoded date : UTC 2014-10-13 15:03:58
Tagged date : UTC 2014-10-13 15:03:58


Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.0
Format settings, CABAC : Yes
Format settings, ReFrames : 5 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2h 46mn
Bit rate : 7 307 Kbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.118
Stream size : 8.51 GiB (97%)
Language : English
Encoded date : UTC 2014-10-13 15:03:58
Tagged date : UTC 2014-10-13 15:03:58
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709


Audio
ID : 1
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 2h 46mn
Bit rate mode : Constant
Bit rate : 192 Kbps
Channel(s) : channel0
Channel(s)_Original : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 229 MiB (3%)
Language : English
Encoded date : UTC 2014-10-13 15:03:58
Tagged date : UTC 2014-10-13 15:03:58

[David (PassMark)]

We have never done any Vegas PRO benchmarks. You might be better off after this question in a Vegas forum.

My rough guess would be that it would be twice as fast.