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so, i try playing a pixelmon server that runs on pixelmon 3.5.1, and uses 1.7.10. when i load the server, i either stay for like 1 minute and i crash, or it goes right to a crash screen. it says i run out of memory, even though i have about 4 gbs of ram dedicated for minecraft. here is the crash log.

---- Minecraft Crash Report ----
// My bad.

Time: 4/29/16 4:52 PM
Description: Registering texture

java.lang.OutOfMemoryError: Java heap space
at net.minecraft.client.renderer.texture.TextureUtil.func_110993_a(TextureUtil.java:241)
at net.minecraft.client.renderer.texture.TextureUtil.func_110995_a(TextureUtil.java:232)
at net.minecraft.client.renderer.texture.TextureUtil.func_110989_a(TextureUtil.java:194)
at net.minecraft.client.renderer.texture.SimpleTexture.func_110551_a(SourceFile:48)
at net.minecraft.client.renderer.texture.TextureManager.func_110579_a(TextureManager.java:89)
at net.minecraft.client.renderer.texture.TextureManager.func_110549_a(TextureManager.java:172)
at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110544_b(SimpleReloadableResourceManager.java:143)
at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110541_a(SimpleReloadableResourceManager.java:121)
at net.minecraft.client.Minecraft.func_110436_a(Minecraft.java:617)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:327)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:552)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at net.minecraft.client.renderer.texture.TextureUtil.func_110993_a(TextureUtil.java:241)
at net.minecraft.client.renderer.texture.TextureUtil.func_110995_a(TextureUtil.java:232)
at net.minecraft.client.renderer.texture.TextureUtil.func_110989_a(TextureUtil.java:194)
at net.minecraft.client.renderer.texture.SimpleTexture.func_110551_a(SourceFile:48)

-- Resource location being registered --
Details:
Resource location: minecraft:textures/font/ascii.png
Texture object class: net.minecraft.client.renderer.texture.SimpleTexture
Stacktrace:
at net.minecraft.client.renderer.texture.TextureManager.func_110579_a(TextureManager.java:89)
at net.minecraft.client.renderer.texture.TextureManager.func_110549_a(TextureManager.java:172)
at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110544_b(SimpleReloadableResourceManager.java:143)
at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110541_a(SimpleReloadableResourceManager.java:121)
at net.minecraft.client.Minecraft.func_110436_a(Minecraft.java:617)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:327)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:552)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 38129024 bytes (36 MB) / 484966400 bytes (462 MB) up to 484966400 bytes (462 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G -Xmx512M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1558 4 mods loaded, 4 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJA FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UCHIJA Forge{10.13.4.1558} [Minecraft Forge] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UCHIJA pixelmon{3.5.0} [Pixelmon] (Pixelmon-1.7.10-3.5.1-universal.jar)
GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.5.0 NVIDIA 355.98' Renderer: 'GeForce GT 720/PCIe/SSE2'
Launched Version: 1.7.10-Forge10.13.4.1558-1.7.10
LWJGL: 2.9.1
OpenGL: GeForce GT 720/PCIe/SSE2 GL version 4.5.0 NVIDIA 355.98, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

so, i try playing a pixelmon server that runs on pixelmon 3.5.1, and uses 1.7.10. when i load the server, i either stay for like 1 minute and
i crash, or it goes right to a crash screen. it says i run out of memory, even though i have about 4 gbs of ram dedicated for minecraft. here is the crash log.

I'd say you're mistaken about having 4 gbs of ram dedicated for minecraft, since your crash log indicates otherwise:

Memory: 38129024 bytes (36 MB) / 484966400 bytes (462 MB) up to 484966400 bytes (462 MB)

JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G -Xmx512M

the second -Xmx entry overrides the first, to only give it about half a gb of ram maximum.

how do i fix that?

If you're using the default launcher, use the Edit Profile button, and remove that extraneous -Xmx entry from the JVM arguments.

i deleted JAVA_OPTIONS, and in the crash log it still says -Xmx512M. i checked the jvm arguments under edit profile it only has my input (-Xmx4G)