Need advise on gaming PC up gradation.

Good Evening Geeks,

Currently I am using 3 year old assemble PC. I am looking forward to upgrade. I would need your advises on the same.

The answers that I am looking --
1 - Will that be possible to change/upgrade few necessary parts for upgrade
2. Do I need to upgrade my entire components.

Please go through my detail PC configuration.

Thanks a billions in advance...
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Summary
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Operating System
Windows 10 Pro 64-bit
CPU
Intel Core i7 3770 @ 3.40GHz 55 °C
Ivy Bridge 22nm Technology
RAM
8.00GB Single-Channel DDR3 @ 667MHz (9-9-9-24)
Motherboard
Intel Corporation DZ75ML-45K (CPU 1) 30 °C
Graphics
Generic Non-PnP Monitor (1920x1080@60Hz)
2047MB NVIDIA GeForce GT 520 (ZOTAC International) 39 °C
Storage
931GB Seagate ST1000DM003-1CH162 (SATA) 29 °C
Optical Drives
HL-DT-ST DVDRAM GH24NS95
Audio
High Definition Audio Device
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CPU
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Intel Core i7 3770
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Cores 4
Threads 8
Name Intel Core i7 3770
Code Name Ivy Bridge
Package Socket 1155 LGA
Technology 22nm
Specification Intel Core i7-3770 CPU @ 3.40GHz
Family 6
Extended Family 6
Model A
Extended Model 3A
Stepping 9
Revision E1/L1
Instructions MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, Intel 64, NX,
VMX, AES, AVX
Virtualization Supported, Enabled
Hyperthreading Supported, Enabled
Fan Speed 1004 RPM
Bus Speed 100.0 MHz
Stock Core Speed 3400 MHz
Stock Bus Speed 100 MHz
Average Temperature 55 °C
Caches
L1 Data Cache Size 4 x 32 KBytes
L1 Instructions Cache Size 4 x 32 KBytes
L2 Unified Cache Size 4 x 256 KBytes
L3 Unified Cache Size 8192 KBytes
Cores
Core Speed Multiplier Bus Speed Temperature Threads
Core 0 1599.6 MHz x 16.0 100.0 MHz 56 °C APIC ID: 0, 1
Core 1 1599.6 MHz x 16.0 100.0 MHz 53 °C APIC ID: 2, 3
Core 2 1599.6 MHz x 16.0 100.0 MHz 56 °C APIC ID: 4, 5
Core 3 1599.6 MHz x 16.0 100.0 MHz 56 °C APIC ID: 6, 7
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Motherboard
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Manufacturer Intel Corporation
Model DZ75ML-45K (CPU 1)
Version AAG75008-102
Chipset Vendor Intel
Chipset Model Ivy Bridge
Chipset Revision 09
Southbridge Vendor Intel
Southbridge Model Z75
Southbridge Revision 04
System Temperature 30 °C
BIOS
Brand Intel Corp.
Version MLZ7510H.86A.0006.2012.0907.1307
Date 07-09-2012
Voltage
CPU CORE 0.944 V
+12V 12.032 V
+3.3V 3.376 V
+5V 5.101 V
DRAM 1.504 V
PCH 1.056 V
PCI Data
Slot PCI
Slot Type PCI
Slot Usage In Use
Data lanes x16
Slot Designation PCIe_X16
Characteristics 3.3V, Shared, PME
Slot Number 0
Slot PCI
Slot Type PCI
Slot Usage Available
Data lanes x1
Slot Designation PCIe_X1
Characteristics 3.3V, Shared, PME
Slot Number 1
Slot PCI
Slot Type PCI
Slot Usage Available
Data lanes x1
Slot Designation PCIe_X1
Characteristics 3.3V, Shared, PME
Slot Number 2
Slot PCI
Slot Type PCI
Slot Usage Available
Data lanes x4
Slot Designation PCIe_X4
Characteristics 3.3V, Shared, PME
Slot Number 3
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Graphics
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Monitor
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Name Generic Non-PnP Monitor on NVIDIA GeForce GT 520
Current Resolution 1920x1080 pixels
Work Resolution 1920x1040 pixels
State Enabled, Primary
Monitor Width 1920
Monitor Height 1080
Monitor BPP 32 bits per pixel
Monitor Frequency 60 Hz
Device \\.\DISPLAY1\Monitor0
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NVIDIA GeForce GT 520
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Manufacturer NVIDIA
Model GeForce GT 520
GPU GF119
Device ID 10DE-1040
Revision A2
Subvendor ZOTAC International (MCO)/PC Partner (19DA)
Current Performance Level Level 1
Current GPU Clock 270 MHz
Current Memory Clock 360 MHz
Current Shader Clock 360 MHz
Voltage 0.900 V
Die Size 79 mm²
Release Date Apr 12, 2011
DirectX Support 11.0
OpenGL Support 5.0
Bus Interface PCI Express x16
Temperature 39 °C
Driver version 23.21.13.9065
BIOS Version 75.19.1b.00.01
ROPs 4
Shaders 48 unified
Memory Type DDR3
Physical Memory 2047 MB
Virtual Memory 2048 MB
Bus Width 32x2 (64 bit)
Filtering Modes 16x Anisotropic
Noise Level Silent
Max Power Draw 29 Watts
Count of performance levels : 2
Level 1 - "2D Desktop"
GPU Clock 270 MHz
Memory Clock 540 MHz
Shader Clock 360 MHz
Level 2 - "3D Applications"
GPU Clock 810 MHz
Memory Clock 1620 MHz
Shader Clock 533 MHz
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