HP says.. if you type it in correctly.. Just buy DDR3 1333MHz -whistle.. but seriously, just download CPU-Z and check the memory section.
CPU-Z is a program that displays information on various parts of your computer. Download Link: http://www.cpuid.com/downloads/cpu-z/1.58-setup-en.exe This should help you find your model number: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00033108&lc=en&cc=us&dlc=en
1064 MHz (532*2) is probably the actual speed, and 1334 MHz (667*2) could be what your RAM is capable of, depending on where your looking in the SPD tab. Anyways, it's likely that your using DDR3 RAM, since the standard for DDR3 memory runs from around 800 MHz to 2100 MHz.
So what should I be looking to get? I believe if I get a higher MHZ, it's backwards compatible right? But I'm confused about the speed to get.
Judging from your posts, you still seem confusing - download this - http://www.piriform.com/speccy It tells you precisely what RAM is installed on your system ..... noob proof!!!!! From speccy my RAM is - Code: RAM Memory slots Total memory slots 4 Used memory slots 2 Free memory slots 2 Memory Size 8192 MBytes Physical Memory Memory Usage 31 % Total Physical 7.92 GB Available Physical 5.40 GB Total Virtual 8.00 TB Available Virtual 8.00 TB SPD Number Of SPD Modules 2 Slot #1 [B]Type DDR3[/B] Size 4096 MBytes Manufacturer STT [B]Max Bandwidth PC3-10700 (667 MHz)[/B] Part Number SUPERTALENT02 SPD Ext. EPP JEDEC #4 Frequency 685.7 MHz CAS# Latency 9.0 RAS# To CAS# 9 RAS# Precharge 9 tRAS 25 tRC 34 Voltage 1.500 V JEDEC #3 Frequency 609.5 MHz CAS# Latency 8.0 RAS# To CAS# 8 RAS# Precharge 8 tRAS 22 tRC 30 Voltage 1.500 V JEDEC #2 Frequency 533.3 MHz CAS# Latency 7.0 RAS# To CAS# 7 RAS# Precharge 7 tRAS 20 tRC 27 Voltage 1.500 V JEDEC #1 Frequency 457.1 MHz CAS# Latency 6.0 RAS# To CAS# 6 RAS# Precharge 6 tRAS 17 tRC 23 Voltage 1.500 V Slot #2 [B]Type DDR3[/B] Size 4096 MBytes Manufacturer Corsair [B]Max Bandwidth PC3-10700 (667 MHz)[/B] Part Number CMSO4GX3M1A1333C9 SPD Ext. EPP JEDEC #4 Frequency 685.7 MHz CAS# Latency 9.0 RAS# To CAS# 9 RAS# Precharge 9 tRAS 25 tRC 34 Voltage 1.500 V JEDEC #3 Frequency 609.5 MHz CAS# Latency 8.0 RAS# To CAS# 8 RAS# Precharge 8 tRAS 22 tRC 30 Voltage 1.500 V JEDEC #2 Frequency 533.3 MHz CAS# Latency 7.0 RAS# To CAS# 7 RAS# Precharge 7 tRAS 20 tRC 27 Voltage 1.500 V JEDEC #1 Frequency 457.1 MHz CAS# Latency 6.0 RAS# To CAS# 6 RAS# Precharge 6 tRAS 17 tRC 23 Voltage 1.500 V As you can see from the TYPE and MAX BANDWIDTH tabs, you can easily tell (can get the same RAM that's installed on your system) so you have to be a total idiot to get it wrong after this.
The tests shows: Max Bandwidth PC3-10700 (667 MHz) So would something like this work? It should be backward compatible right? PC3-10600 or PC3-10666 (1) Thanks
Keep in mind that there's nothing wrong with running faster memory than your motherboard is spec'd for. If you're running say DDR3 1600 on your 1333 motherboard, the memory will just under clock down to 1333.